The roundtime when invoking a cambrinth can be worked down to 1 second, but if there's no mana in the cambrinth it still takes 5 seconds with the same cambrinth. Can we get the roundtime for the case when there's no mana reduced to match the success roundtime?

R> invoke armb 30 spell
The cambrinth armband is dim, almost magically null. A very faint pattern indicates its readiness to absorb Elemental energy.
Roundtime: 5 sec.

>invoke armb 30 spell
The cambrinth armband pulses with Elemental energy. You reach for its center and forge a magical link to it, readying all of its energy for your use. By directing your focus, you ensure that energy is drawn only when spells are cast.
Roundtime: 1 sec.