Quicken
 

The tooltip says it lasts 11:00 minutes, but when I cast it at lvl 16, it only lasts 4:12. I am nearly 100% positive this is not how it was on the classic servers. (Quickness, not Quicken BTW)

think at level 50 it'll be 11 mins :(

Hmm... 80 mana for 4:12, silly. I think you may be right though =/

No, this is wrong. It is supposed to increase from 11:00, at lvl 16.

It's the same way for a lot of spells. It says "up to" X time which is when you max out the spell level. I think it's intentional to sort of ramp your power as you level besides giving you new spells. For example Druids thorns are the same way when they get them at 9 but by 18 it lasts the full duration and so you can keep buffs up easier.

The spell information window gives the maximum duration for the spell. Yes, it's shorter than 11 minutes when you first get it.

It's rather a pain in the ass to use, but that's how it was on EQLive.