On my first character alone it was 370+ days at some point, and I retired her when the first time expansion came out. Safe to say I've spent years on that game, even though I don't even remember how long ago I quit.
Yep, my main has around 400 and I don't even want to think about adding up all the many alts and dead HC characters at this point ... They don't call it world of warcrack for no reason. I will say I have had a ton of fun with it over the last 15 years. I've only played casually witha few very brief stints of raiding a little more seriously.