The Plan

[Shodokan]

Whichever toon is boosting, call that Account A.
Call the other existing accounts B and C.

RAF link like this:
A
B -- Linked to -- D
C -- Linked to -- E

Group BCDE. Boost with A.
Get as many sets of four to 60th as you care to.
It's a lot faster now, with RAF then it will be down the road.

From your avatar/picture, I'll guess you are horde.
Boost like this:

1-10 Quest, everyone grouped.
11-20 Shadow Fang Keep
20-45 Scarlet Monastery
45-55 Stratholme
55-60 Ramparts

Then do the next team.
When you're done leveling teams from 1-60.
You can quest or boost, I'd boost to 68th or so.

60-65 Underbog.
65-68 Auchendoun instance of choice.

I somewhat agree with this, and will go more in depth of how i boosted my RAF in the past.

1-8 questing
8-16 rfc
16-22 sfk
22-25 sm library
25-40 sm [armory > cath > reset> cath> armory] > repeat brackets
40-44 zf (2 runs) if you get the quests this brings you to 45 (go'zirra nolonger requires that mallet)
45-55 stratholme undead side OR scholomance (if boosting with a paladin i would go with the sholomance 2 room method)
55-60 = ramparts
60-65 = ramparts (about 1 hour per level- i did this on a ret paladin) but underbog is fine too, just longer.
65-68 = auchendoun instance (i chose sethekk halls)
68-73 = Upguard Keep (can be soloed by druid or prot paladin but if you are running 4 classes with a heal...any class will do)
73-75 questing
75-80 = north western part of icecrown (refer to hobb's videos)

Total time for boosting to 60 = ~ 12-16 hours
Total average time per level till 68 = 2 hours
Total average time per level till 73 = 2-4 hours (depending on run speed)
Total time questing = I'd GUESS about 5 hours for a boxer, maybe 6 per level
Total time 75-80 = With only ME it was 1 hour per level, with a boxing team i'd guess 2-3 hours per level but because you can heal much better for your runner (regardless of class) you could cut down time for more kills with bigger pulls. Also this assumes minimal looting.

Total time: ~ 75 hours

3 days played.