How long can I depart from a late 12-volt vast cycle on a charger on the 10 AMP setting? No trickle or 2 amp setting, 10 is the lowest.

No trickle or 2 amp setting, 10 is the lowest.
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Answers:    Anything over 2 or 3 amps can significantly reduce the time of the battery.

Try this: Charge is for almost 30 minutes, then permit it sit for another 30 minutes, then read the open-circuit voltage of the mobile. If it is under 12.4V, do it again. Keep doing this until the OCV is equal to or above 12.4V