I live in middle Georgia.
In the summer, my L1 charge times have been 14-15 hours due to the heat.
In the winter, my L1 charge times have been 13.5-14.5 hours due to the cold.
In fall (and assuming spring), my L1 charge time has been around 12-13 hours.
I primarily charge with an L2 charger and regardless of season, a full charge takes around 2 hours because of both the higher charging current and the fact that it can use some of that energy to heat/cool the batteries to optimize charging temperature. (at least that's what I think happens... The cooling fan runs faster on L2 than L1 when it's hot)