How is length of time to beat a game determined

Needs to be on the site somewhere stating how these “times to beat a game” are determined. By pro players or what. I see games saying 50 hours completionist and I have friends who have doubled that time and not even done with main story. These should be clear on how they are determined.

If you click or tap on the “How Long To Beat” link it will take you to the corresponding howlongtobeat.com page. HLTB is a resource that collects completion time from users. We simply display the data they have collected.