I think it depends on the amount of fun you have. There’s a difference between “I grinded for 30 hours to get this item, I felt pulled into doing it and now I’m 6 hours late for work” addictive fun, “I played for 30 hours on and off, it was such a relaxing experience” chill tf out fun, and “I played for 30 hours, I broke my controller from gripping it too hard and my heart was pounding the whole time” hardcore action fun. It’s tough to gauge a game just on how much time it takes to complete.