I haven’t logged into WoW Classic for two weeks. I guess that answers the question about how long it would hold my attention.
Why have I stopped?
Well, WoW Classic is a really terrible single-player game. The group content is fun. But solo play is a chore.
All of my dreams of playing with my old friends did not come to fruition. When we originally played together back in vanilla, we were all willing to set aside time in our lives to log on at set times to play group content. Now, 15 years later, we aren’t those people anymore. Since we weren’t logging in on a set schedule, we were only rarely online at the same time, and there was never a time when we could play together as a group.
Also, patch 8.2.5 in retail brought the bee mount and a rep grind to go with it. I’ve been logging into retail every day to work on that, and to finish off my Rustbolt rep on my main. So I am still playing, but Classic has lost me.