Since your battery was pretty close to zero capacity and your charger only puts out an amp, it would take ~60 hours of sunlight to fully charge it.
The funny thing about a really badly damaged battery is that the same thing will occur when you try and charge it. The same bad cell will reverse polarity and your charging voltage will go down, when it should be going up.
As I said, we can walk you through load/capacity checking when(if ever) your battery is ready.
As far as I can tell, if you were right now to unhook your panel and hook up your lights, the voltage would probably drop below 10.5 volts within minutes, if not seconds.
Do not let your voltage drop below 10.5 volts. Ever.
ps. It's been 30 years since I've actually studied lead acid batteries, so you will have to forgive me if it takes time for some of these old memories to come unhinged from the cobwebs.