The way that I have been timing my runs is how often do I refresh pally buffs
in most cases I can run 2 and be already into a 3rd as I refresh. Obviously ther are some heroics that will take 17min to 20min. I feel that the numbers given in his guide are very reasonable. If you are getting slower times maybe it is your gear or grp make up. I do not run a dedicated healer. 4 ele + a sham is a lot of dps I'm 5k + GS on all 5.