I was looking at my Switch profile, and while Breath of the Wild has been dominating my time, a few other games are clearly receiving their fair share of attention as well. Getting towards the 3 month mark since the launch of the Switch, I thought it might be interesting to see the play time others are putting into some of the titles in the Switch's software library on the system that supposedly only has "1 game". I'm also going to limit my list to games that I've put over 5 hours into, since I have a number of digital titles like Metal Slug 3 and Shock Troopers that I've played through the campaigns of, but don't amount to significant gameplay hours overall. You can also list which titles are complete or not complete to indicate whether that playtime is still growing or if peaked.
Legend of Zelda: Breath of the Wild (over 155 hours) still playing
Shovel Knight: Treasure Trove (over 40 hours) complete
I Am Setsuna (over 15 hours) still playing
Puyo Puyou Tetris (over 5 hours) still playing
As a footnote, I just picked up Disgaea 5 Complete on Friday and have started putting time into it. So, that is going to be shooting it's way up my gameplay chart as well. The DLC bundled side story battles that I have played so far have lended perfectly to short spurt on the go gaming sessions.