As others said, level 1 charging is more than enough for a lot of people. There are also compromises in between level 1 and level 2. The car will likely take pretty much anything you throw at it. So for example if you have 2 circuits to the garage you can gang them to get 240V/15A for double the speed of level 1. Of it might be a 20A capable connection -- 120V/20A (16A continuous) is noticeably faster than 120V/15A (12A continuous).