Do the math.
If you drove 40 miles and the battery and charger had a
70% efficiency between the charger (90%) and the electro chemical
efficiency of the battery (80%)it would take 40kw / 4 = 10Kw , 1800 (NFPA max
output of 120 Vac NEMA20R outlet)watts * .70
= 1260 watts. Therefore your trip would take 10Kw/1260 =
7.93 = 8 hours. This does not include cell equalization.
Add at least 1 hour for full charge and you have about
9 hours for your trip to work and home.
Now take a car like the Tesla. it has a range of 250
miles with a 56kwh battery.(downhill of course).
That gives 56000/250 4 miles per kwh.
it would take 46 hours to recharge. Even that is conservative. My guess is
about 52 hours or 2.2 days from a NEMA20R Outlet.