About 15-20 hours of Assassin's Creed Black Flag on the PC. It was some bullshit involving their cloud saves getting way behind for some reason and then overwriting your local auto save in a game where I didn't really think Manual Saves were that important. I walked away from that game for almost 2 years after that happened.

I go on the internet and basically saw a mob of people that had this happen to them saying "for the love of god turn off cloud saves if you are playing this game!" but it was too late for me.

Most hours of gameplay you ever lost due to glitch/crash/power failure etc?

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