So I've been noticing this for a while but only really looked at it now was that Haste doesn't seem to get affected by gear that increases the duration of enhancing magic.
I only looked at it once but I just compared the duration of refresh II and haste and found:
Refresh II lasted 3:11
Haste lasted 3:13
This is with RDM feet +2 and the cape which at least according to wiki should be a 30% increase. Refresh II is supposed to be a 2:30 duration which would be a 41 second increase here while haste is meant to be a 3:00 duration so this would only be a 13 second increase.
So i'm just curious now if anyone knows more about the "Increase duration of enhancing magic" effect and whether it only affects certain spells.