This is dependent on what charging configuration you have installed. Below, is the time based from a full discharge state of 10.8vdc. The MPS system, since January 2017, are designed to only operate one charger @ 55A when the system is on shore power, during generator operation the system is charged at 110 Amp.
MPS-3400 – 110A – 12 hours (Generator)
MPS-3400 – 55A -24 hours (Shore Power)