If it is a single voltage rate charger, a VERY long time. If you are using a triple rate charger and your converter distance from battery and/or wire gauge aren't too far and/or thin you should be fully charged in a day. It only takes most triple rate chargers to get to 90% charged in 3-4 hours, the last 10% can take a while.
If your battery went to 12 volts, it may have been permanently damaged and may never whole a full charge.
These are SWAGs-scientific wild "A22" guesses since we don't know what type/size converter your have or battery capacity.
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