Because you plugged it home every night prior. Even on a normal outlet, 10 hours of charging can give you 40 miles (about 65km) per day. That’s over 14,000 miles (22,500km) per year. And I’d hazard a guess that most people are usually home more than 10 hours a day, especially on the weekends. And that’s for a barebones level 1 setup. When you go into the world of 240 volts you at least double your power, and can easily go from 0-100 in 6 hours or less with a fairly common 40A setup.

So why would you need a charger nearby?