There are lots of RAF setup threads.

When it comes to RAF from 1-60 my last group completed this in 15 hours played time. Im sure I could have done it faster as there were times I got up and walked away to eat and stuff and just left them standing there. Also Im on a pvp server and there were 2 times I got messed with while running to the next instance.

1-10 Crabs
10-20 Shadowfang Keep
20-35 Scarlet Monistary
35-45 Sunken Temple
45-60 Scholomance

All the zones are on the same continent so that helped. Also I did not have to move any of my low level guys from the zone in to get all the XP. I only had to visit 4 instances so running all over the place was cut down. Also I had a full group and that does help with the XP gain. If you only have 3 people in your group it will take an extra run or two more at each instance.