Your trading method is also important here.
Yes, no exception. Full time or not but having a method that's very effective to you will make you a successful trader.
I think yes. In order to be a good trader, you need to trade 24/7.
Don't kill yourself. Have some rest, trading without sleep is going to bust you and that's for sure. Rest and sleep are important when you trade and upon doing other important activities. You can learn by having enough sleep although the market is operating 24/7.