Well if you regular level a group of 4 to 60, then you have 30 levels to give away. Level your next group to 40 grant 3 of them up to 60, transfer on and grant him up to 60 then you have 8 60s and you saved yourself 15 hours or more.

I currently have one group of 3 locks to 60 (36 hours)

who granted my second group pally priest priest to 60 after they were 41(6 hours)(19 levels from locks)

I have 3 mages that will be 60 this weekend(30 hours)

Who will then grant my 3 shaman who will be 41(6 hours)(19 levels from locks)

Then I have a shaman, shaman druid group that I am leveling to 40(6 hours) that I can grant to 60( 10 levels from locks 10 from mages)

so that's 3 days 12 hours to get 15 60s.

BTW, I have a serious problem.