Continual Fly
(Enchantment)

Range:  0
Components:  V, S, M
Duration:  Special
Casting Time:  5
Area of Effect:  Creature touched
Saving Throw:  Negates

This spell functions as the 3rd-level fly except that the duration applies to time actually spent flying, not time elapsed since the casting of the spell. Eg., you can use half the duration today and the other half tomorrow.

