I would evaluate the question a little differently and focus on the bigger picture.
The Loveseat Of Long Lived Hadrons and the Long Lived Fundamental Particles
Hadrons
The "zoo of long lived hadrons" is more like a loveseat.
There are exactly two hadrons with mean lifetimes in excess of 10-5 seconds: the proton, which is stable, and the neutron, which has a mean lifetime of about 15 minutes (879.6±0.8 s) when free and is stable in a bound state within a stable atomic nucleus.
(The complete stability of the proton is theoretical, but proton decay has never been observed and the experimental lower bound on the mean proton lifetime is not shorter than the age of the universe and then some.)
If you really want to be pedantic about it, you'd also include the anti-proton and anti-neutron, which have exactly the same mean lifetimes. But, in practice, the universe is so matter dominated (relative to antimatter) that, absent magnetic cages, anti-protons and anti-neutrons almost always annihilate swiftly upon coming into being when they bump into ordinary matter that is almost everywhere. So, anti-protons and anti-neutrons end up being short lived in practice even if they are not short lived in theory.
Leptons
The only charged lepton with a mean lifetime in excess of 10-5 seconds, of course, is the electron, which like the proton is stable.
Neutrinos (which are neutral fundamental leptons rather than hadrons) are "metastable" (not really the right word) in the sense that they can oscillate between generations in some circumstances, but don't "decay" as such.
Stable Fundamental Bosons
Individual photons are stable, lasting until they are absorbed by a charged particle (possibly billions of years), or together with another photon lead to photo-production of something else.
As explained below, gluons don't precisely "decay' but are short lived because they are confined within hadrons and move at the speed of light over very short distances between color charged quarks and gluons.
The Zoo Of Short Lived Hadrons and Fundamental Particles
The muon and three kinds of spin zero pseudo-scalar mesons (and their antiparticles) have mean lifetimes of more than 10-9 (i.e. one billionth) of a second.
The mean lifetime of a muon, the second generation electron, which is a fundamental particle in the Standard Model, is on the order of 10-6 (i.e. a millionth) seconds. This is about 100 times as long as the three longest lived types of mesons discussed below. It can decay only via the weak force.
The charged pion made of an up quark and an antidown quark, the charged kaon made of an up quark and an antistrange quark, and the long form of the neutral kaon consisting of the linear sum of a down quark and an antistrange quark (which appears only in combination with the short neutal kaon linear combination of the difference between that particle with a much shorter mean lifetime), all have mean lifetimes on the order of 10-8 seconds.
The Many More Very Short Lived Hadrons and Fundamental Particles (Lifetimes Less Than 10-9 s And More Than 10-25 s)
About a hundred other kinds of hadrons, tau leptons (i.e. third generation electrons), top quarks, W bosons and Z bosons all have mean lifetimes of less than a billionth of a second. Gluons are also effectively very short lived.
The Six Most Ephemeral Fundamental Particles
A tau lepton (i.e. a third generation electron) has a mean lifetime on the order of 10-13 seconds, which is similar to the longer lived B mesons, D mesons, and spin-3/2 baryons, and is about 100,000 shorter than that of the longest lived mesons.
The Higgs boson's mean lifetime has not been measured experimentally to this precision (although there is a fairly strict experimentally measured upper bound on its mean lifetime), but it is predicted in the Standard Model to have a mean lifetime of 10-22 seconds - similar to that of many hadrons with aligned spins, and about 1000 times as long as that of the top quark, W boson and Z boson.
Gluons are in principle as long lived as photons, but in practice, are only exchanged between color charged objects at very short range while moving at the speed of light, so they are in existence for only a time period on the order of 10-24 seconds and certainly far less than 10-9 seconds. Also, outside a high energy "quark-gluon plasma" gluons never appear outside of a hadron and their existence is only inferred indirectly rather than being directly measured in isolation.
The mean lifetime of a top quark (i.e. the third generation up type quark) is about 5*10-25 seconds, which is about ten times shorter than the shortest lived hadron. And, since theory dictates that this time period is too short for hadronization to occur at any meaningful frequency, all hadrons should have longer mean lifetimes than the top quark.
The W boson and Z boson have mean lifetimes of about 3*10-25 seconds, i.e. about 40% shorter than that of the top quark (which makes since because W bosons are what makes top quark decays possible).
Bottom Line
There is an eight order of magnitude difference between the mean lifetime of the neutron and the next longest lived hadron or charged lepton or massive fundamental boson. Even almost all of the atomic isotopes (some atomic elements don't even have truly stable isotopes) that we commonly think of as extremely unstable are longer lived than 10-5 seconds.
This is why the vast majority of ordinary matter in the universe is made up of protons, neutrons, and electrons (neutrino masses are so small that they don't much up a very large share of ordinary matter despite the fact that there are vast numbers of them in the universe and photons are massless), despite the hundreds of other possible hadrons and the two other possible charged leptons.
Note also that if dark matter particles exist, at least one kind of dark matter particle needs to be stable or at least metastable with a very long lifetime, although there could be a "dark matter particle zoo" of addition short lived dark matter particles.
Fun Fact
All of the mean fundamental and composite particle lifetimes in the Standard Model are derived quantities that can be calculated to the greatest precision that your measurements of the parameters of the Standard Model and your ability to do the calculations allows.
They are not themselves fundamental parameters (although the mean lifetime of the muon is the primary observable used to measure the Fermi's constant, which is the form in which the weak force coupling constant is normally used in calculations).
Observation
Decays of heavy fundamental particles are sensitive to the existence of undiscovered fundamental particles which could provide decay paths for the heavy particles.
But only if the undiscovered fundamental particles have some quantum number that is present in the original particle or can produce pairs of particles in the ends state that cancel each other out with respect to this quantum number. For example, a quark with lepton number zero can produce leptons as decay products, so long as they come in lepton-antilepton pairs.
So, the fact that the mean decay times of the fundamental particles and hadrons match the Standard Model expectation is a robust global confirmation of the completeness of the Standard Model menagerie of particles up to about 87 GeV (i.e. half the top quark mass), with only a few well defined exceptions (most famously a hypothetical quantum number called R-parity which would distinguish supersymmetric particles from non-supersymmetric particles).
