Depends on many different things. What type of bot you use (Questing, BGBuddy, Archaeoloy). Obviously some are faster but require more babysitting. Also depends on how many hours a day you bot, and slightly what class you are.
I leveling my Monk (yesterday finished) about 5 day played time (1-90). Using Kick's quest profiles (don't use gathering) to 85 and after 85-90 used grind profiles 2-5 million xp / hour rates.
