I have thousands of hours in Smash Bros 4WiiU and Ultimate. It's hard to get an accurate count since I used to go to so many tournaments and have also played on other peoples' consoles so often. If you totaled all of my hours in Pokémon games I'm sure there's a lot there too. My Pokémon White save file had over 999:99 hours in it and on average I usually get at least 400 hours or so in other Pokémon games. I've played Scarlet and Violet alone with three full playthroughs total with my main file having so much mileage. Checking my Switch profile, it seems I have over 1500 hours on just my save file for Smash Ultimate but Animal Crossing New Horizons and Splatoon 3 are pretty close behind at over 300 hours each.
Currently the game I play the most is probably Pokémon Unite, though I really only tune in for like an hour max per day to play a couple quick matches and then ranked until I get a win.