Yes and no. Remember, original Ed did not hop back in time, but rather he sent his knowledge and skills back to the his original self when he first arrived in the white room. So, at this point, he's on the first world -- and he has yet to visit/help/fix those other 99 worlds. (Moreover, he now has very good reason to suspect that those other worlds will also need him to do more than what his previous future self did.)No.. That's the 1st after he already finished the 100 Worlds x_x.. So it's technically World 101
Time spent: He's been doing this for 100 years. (See first page of first chapter.)
Home: Ed apparently still wants to go back to his original world, the world he came from before he was first yanked into the white world.