Silly question to ask, 99% of the answers you'll get will be total BS. Somewhere around 1.5 days played, give or take a few hours in any direction would be normal doing the RAF dungeonbuddy method. Straight questing would be closer to 3-3.5 days played.
the problem im getting with RAF's bonus exp is undergear, of course that can be solved by heirlooms but im a cheap ass bitch dont want to buy a set for each char (i raf'ed 3 char tank healer dps)
I'm on 3 days 19 hours 34 minutes 3 seconds and I'm level 84 in Uldum questing. This is no heirlooms / raf and all kicks questing with about 5 dungeons so far done.
If i use the RAF and just invite my main into a party with my alt will I still get x3 xp when i quest/grind