Zelda: BotW Official guide sugests there are 76 side quests, 120 Shrine mini-dungeons, 900 Korok seed puzzles..

[SegataSanshiro]

Sorry 76 sounds tiny to me. I do that with the first 20 hours of RPGs. I end up completing hundreds. Not knocking it just saying I am used to 3-4x that just on average.