I mean, Baaaa man. GOAT or a Goat, you still the GOAT. Like this game.
Believe me... some people can do many things without getting bored, while another person would probably quit the game and go jump onto another one. Like the grinders (people who can grind for plenty of hours with no issue) the explorers (explores the whole map/everything the game has to offer and redoing that over and over) it's crazy.
Just like playing any game for 100+ hours. It must have you hooked/interested enough to keep you playing for that long.
At once? hmm, that person mentioned 1 year so, it wasn't a whole day or so of non-stop play. You put plenty of time in it yourself, GOAT!