> a regular 120v outlet and use level 1 charging, which fills up most cars in about 8 hours

A regular 120V outlet is 15A at best (usually 12A). That's barely enough to charge a PHEV in 8h, let alone a BEV. Practical example [0]:

> connected to a 240V outlet, the onboard 7.7kW charger should take the battery from 0-100% SoC in 2 hours 25 min. (A 120V charge will take a bit longer at just over 16.5 hours.)

[0] https://arstechnica.com/cars/2019/10/on-the-road-with-audis-...