How long will it take?

It takes me now 3 min and 60 pumps to fill a 220cc reservoir. Does that mean it will take twice as long to fill a reservoir that is twice as large? I would certainly think so... I also assume that shot count, caliber, air rifle, and what not, don't really matter, right? The only thing that really matter is, that if the reservoir is twice as large, it will take you twice as long. Correct?

To put this in a real life scenario:

I just got a Marauder in .25 and a Benjamin pump. Like I mentioned above, it takes me around 3 minutes and 60 strokes to go from 2000 to 3000. Does that mean that when I get my FX Impact, I would have to basically just multiply my strokes and time by 2.18 (480cc / 220cc)???

Thanks,

Kmd

EDIT: I am just talking about theoretically. I understand that the Impact is not operation at the same PSI as the Marauder...