Sort of. However, at that level, if you're in the middle of a game and aren't on track to getting a high score, you're probably going to abandon the game and try again from the beginning. Therefore there'll be a fairly high number of games, a sizeable proportion of which are abandoned.

It's like when speedrunners attempt to complete games in the fastest time. If they make a mistake at any point in the game that will cost them a lot of time, they will most likely abandon the game and keep trying until they are able to complete the game without making any costly mistakes.

It depends how much time they put into it. No one checks how many games they play, so one player could play only on weekends while another might also play a few hours every evening.