What if Maneuvers lasted longer than 1 minute?

[Zagen]

What if Maneuver's duration was extended to 5 minutes, 30 minutes, or even 1-2 hours.

The use of a Maneuver every 30 seconds (2 maneuver cycle) comes at the cost of around 6% damage potential (differs based on melee/ws gear).

The use of a Maneuver every 20 seconds (3 maneuver cycle) comes at the cost of around 9% damage potential (differs based on melee/ws gear).

Does increasing the damage potential 6~9% seem over powered?

Something to note this still puts PUP behind a BST in terms of DPS by around 20 damage with Mythic being on par/slightly edging ahead of BST.