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Have a look at this:
https://support-leagueoflegends.riotgames.com/hc/en-us/articles/360001976407-Esports-Watch-Missions
https://boards.na.leagueoflegends.com/en/c/bug-report/fqmpxUad-vod-viewer-mission-troubleshooting
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60 is not absurd since we have a whole split to complete the mission. Not to mention, you dont have to watch 60 times 35 minutes. 15 minutes VODs are enough.