You'll find it in your "profile" (tap on your icon on the top left):
https://twitter.com/AndreSegers/status/837570625833095168
PSA:
"For nearly everyone, it will only list when they first played games right now. But after one week it will switch to hours played"
https://www.reddit.com/r/NintendoSwitch/comments/5y00qv/the_switch_does_have_an_activity_log/
It's not capped. It just shows your playtime by increments of five hours.
https://twitter.com/AndreSegers/status/837570625833095168
PSA:
"For nearly everyone, it will only list when they first played games right now. But after one week it will switch to hours played"
https://www.reddit.com/r/NintendoSwitch/comments/5y00qv/the_switch_does_have_an_activity_log/
It's not capped. It just shows your playtime by increments of five hours.