Here is info from the Bolt forum. I can't confirm the details, but it is about what I experienced.

Typical home Plug - 120 volts on a 15 AMP circuit - derate by 20% - 12 amp continuous load

120 volts * 12 AMPs = 1440 watts or 1.44 kw - do this for one hour at you get 1.44 kilowatt hours

charge the Chevy Bolt from empty with this charging rate and you divide 60 killowatt-hours / 1.44 kilowatt hours = 41.667 hours - that's best case and there is about a 10% loss with the chargers so 41.667 * 1.1 = 45.8 hours - we add a 10% fudge factor to deal with various in-efficiencies in the whole charging infrastructure.

so it will take 46-48 hours to fully charge an empty Bolt from a normal house hold plug @ 12 amps on a typical home 15 AMP circuit.

The Chevy Bolt Default 120 volt setting - 8 AMPS - since many homes were never built with continuous loads in mind - Chevy has taken a conservative approach and defaults the Bolt's 120 volt charging rate to 8 AMPS (or about 50% of a 15 AMP break's load - this is to account for poor plug quality and potentially poor wiring in some homes) - so the math for this default setting to fully charge a Bolt from empty is

120 volts * 8 AMPs = 960 watts or 0.96 kw

60 kwh (volt battery) / .96 kw = 62.5 * 10 % fudge factor = 68.75 hours or there about

some homes/garages have 120 volt / 20 AMP circuits - these are typically used for engine block heaters and use a different plug from the normal household plug - 20 amps * 80% - 16 amp continuous load

120 volts * 16 amps = 1920 watts or 1.92 kilowatts

60 kwh / 1.92 kw = 31.25 hours * 10% fudge factor = *1.1=34.375 hours or about 35-36 hours to charge from a home 120/20 amp circuit - you'd need to find a EV charger for this however because Chevy's charger that comes with the car doesn't support this type of plug/circuit

as you can see 120 volt house hold circuits really don't do the job - to properly charge an EV you typically want to use a 240 volt circuit. To do this there are lots and lots of choices for various EV charges are all sorts of different AMP Ratings. Typically you want to buy an EV charger who's maximum AMP rating matches or exceeds your EV car's charging capability.

The Chevy Bolt can handle up to a 40 AMP circuit, with a 32 AMP continuous draw. So any EV charger up to 40 AMPS will charge your Bolt much faster than your typical 120 volt house hold circuit. Typical 240 volt breakers are: 16 AMP, 24 AMP, 30 AMP, 32 AMP, 40 AMP, 50 AMP, and in increments of 10 AMPS upto 200 AMP circuits (typically a 200 AMP breaker is on most homes for the entire house, most US homes have 80, 100, 125, 150, 200, 400 AMP main whole-house breakers)

Math for charging at 240 volts for various AMPS are:

16 AMP 240 volt breaker - 240 volts * 12.8 AMPS = 3072 watts or 3.072 kw = about 22 hours to fully charge an empty Bolt

20 AMP 240 volt breaker - 240 volts * 16 AMPS = 3840 watts = about 17-18 hours to fully charge an empty Bolt

24 AMP 240 volt breaker - 240 volts * 19.2 AMPS = 4608 watts = about 15-16 hours to fully charge an empty Bolt

30 AMP 240 volt breaker - 240 volts * 24 AMPS = 5760 watts = about 12-13 hours to fully charge an empty Bolt

32 AMP 240 volt breaker - 240 volts * 25.6 AMPS = 6144 watts = about 11-12 hours to fully charge an empty Bolt

40 AMP 240 volt breaker - 240 volts * 32 AMPS = 7680 watts = about 9-10 hours to fully charge an empty Bolt