How much to charge marine battery

Do you guys leave the battery on a trickle charge? I don’t have any roof jobs lines up and battery is now at 13.45 volts. Does keeping it on hurt it?

Some say no, some say yes. If it is for more than 2 or 3 days I’d unhook it. I keep my boat batteries on a trickle charger but the charger is on a timer than comes on 2 hours a day. I have had them boil over. I have 7 in the truck right now ready for a raft trip tomorrow. They are daisy chained to the charger.

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