Like 20 minutes recharging time. Few people will completely deplete their battery.
I think to be successful, electrics will need to be capable of being refueled much like gasoline cars. Pull into a service station, pop out the old fuel canister(s) (fuel cells perhaps? Something new?), pop in the new fuel canister(s), and your good to go. That is not what the gigafactory will provide as I understand it. They are about making batteries for Tesla’s cars which can be recharged multiple times. With the service station model, they can recharge, recondition, or fill the fuel canister to where it can again be inserted into a vehicle and power it for 300 - 500 miles.
Without the convenience of fast refueling, I think the market for pure electric vehicles will be limited to those applications where a day’s use is well within the cars range for a single charge.