Don’t leave the charger hooked up to the battery overnight. My very old charger is a 10amp and when the needle drops about 1/2 from where it started I consider the battery charged. The instructions for the charger are long gone but I believe this was the recommendations of said instruction sheet.
Your charger might be newer and have better circuits and controls than my old one. If you can find the instruction sheet it should cover how long to reach a full charge. Since batteries differ based on age, size, capacity, etc. There is no “one” correct time. I’d rather error on the side of undercharging rather than “cook” a battery by overcharging it.