Board Thread:General Discussion/@comment-208.101.199.133-20141124042253/@comment-35248429-20190826140514

Gsimenas wrote: >and Reki specifically mentioned that there is a high chance of getting it if the account has over 10,000 hours of playtime

[Citation needed] I mean that's literally whats implied in the light novel. That you have a much higher chance of getting a rare avatar if your account has a lot of playing time. And Kirito does indeed almost say he has 10,000 hours. Complete with one of Kirito's dorking math equations in his head.

It's not specifically stated over any specific threshhold of hours, but that's where he's getting that.