Depends on three things, the state of the battery, charger current, and the installed battery capacity.
Using the standard charger (8A) , the 1.5 kWh battery, charging an empty battery to 100%, will take approx 4 hours.
For the 2.3 kWh approx 6 hours, for the 3.3 kWh approx 8 hours, for the 4.1 kWh approx 10 hours, and for the 5.0 kWh approx 12 hours.
The table below list charging times to fully charge an empty battery using the charges available.
In practice the above to times will be shorter, as the battery rarely is fully discharged (empty)