4 x 600mah = 2400mah total capacity. Set charger for basic charge (no need for balance charge with 1s) 3.7/1s @ 2.4amp (1c). As too how long it will take that depends on discharge level and overall condition of lipos. Not critical but try to charge lipos all within same discharge level, in parallel like that they will all self balance....high voltage lipos will "top off" lower voltage lipos until they all equal out. Also again not super critical but try to charge all same brand and general age together.....older lipos with older lipos and newer ones with other newer ones.