Temp.Recharge buffs and long recharge powers

Simple question:

You have a theoretical power that has, for example, a 100 second recharge time.

You get the Force Feedback proc (5 seconds of +100% recharge).

How much time does quickly-fading recharge buff actually remove off the 100 second recharge? Is there a formula? Or does it not change anything in the long run?

For example, say you're 20 seconds into the recharge when the proc goes off.

So, the recharge of the power is temporarily dropped by 50%... 50 seconds?
5 seconds pass.
What happens? Does the remaining time of the power recharge get recalculated, or just it just jump back to the normal recharge time, not changing anything on this long recharge power?

http://wiki.cohtitan.com/wiki/Recharge

Basically, in your example, I think you'd shave 5 seconds off the 100 seconds recharge since a 100% recharge bonus would accumulate 2 points/second during those 5 seconds. Or I believe that's how it would work given the example and no other recharge bonuses to account for.

I believe the way recharge works is that every power's recharge is expressed in a number of ticks of a hypothetical clock that normally is in sync with real time. Any +Recharge makes that clock tick faster. So during the 5 seconds of the recharge buff, 10 seconds' worth of recharge time tick by. After the buff elapses, the tick speed returns to normal.

That's my understanding. Someone like Arcanaville could explain it with much more authority, as well as give you a formula for calculating the exact effect of the buff, I'm sure.