How long does it take to charge an electric car?

This completely depends on the model of the electric car.

The owners manual will give you that information. Different batteries take different times to charge. But usually 8 hours will charge most batteries.

plug it in over night

Sometimes just long enough to sit down at the car dealership with the salesman while he checks your references, credit and income. An hour and a half.

if never undercoated or washed and waxed,about 5 yrs nowadays with the crap they build. my 1990 Olds looks like day we bought it, but our 2004 Ford is already rusted above wheel wells.