In many experiments that show quantum effects particles are given the option to take different paths/routes. This is done using devices that act as mirrors/splitters/joiners/etc. Probably the most famous of these type of experiments is the Delayed Choice Quantum Eraser, but there are many others. These experiments always show us that if it is impossible to know which route the particle has taken (aka the which-path information) the result of the experiment itself will be different. These different routes however have different distances. Sometimes the different distances are obvious and visible via the experiment's diagram. Even if the difference is not obvious I'm assuming it's still there as it seems impossible to me to physically design different routes with the exact same distance, down to the last Angstrom. Now, since the distances are different this also means the time it takes the particle to reach its destination(usually some kind of a detector) will be different, and if this is true, the which-path information is not actually lost. Sure, we might be talking about a very small time difference, such as picoseconds, nevertheless though, a difference is a difference, and with very accurate equipment we should even be able to detect/calculate it ourselves. We can potentially even force the issue by intentionally making some paths much longer than the others, resulting in bigger time differences between the different routes.