Like others have said, a bank of 4 to 6 batteries, 4 or 8D's discharged to 50%, 12.2 volts at a Bulk/Absorption charge not exceeding 14.4 volts for Lifelines will take about 2 1/2 to 3 hours to charge to float. Many variables due to inverters, but that's a good example of charge time.
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