Game's been out for less than three weeks, if you're completing a playthrough under three days, you're rushing the game way too much. To properly explore one playthrough you need at minimum 150 hours...bare absolute minimum. That's at least a week...assuming no sleep or food, which is not how anyone should play...even 12 hours a day is too much to play for extended periods of time.
If they completed 7 playthroughs a day, playing 18 hours a day every day, each playthrough has 54 hours. That's enough time to 100% all of Acts 1 and 2, but means they can't even start 3. So skipping is an understatement.