How many pumps to top off from2000.psi to 3000psi- Bullboss .25 cal

Hello all,
​Thinking hard, after MUCH research on buying a Bullboss .25 cal.
​Can anyone tell me how many pumps(roughly) to top off the Bullboss .25 cal from 2000 PSI to 3000 PSI?
​I made the mistake of not asking this exact question in these exact words prior to buying a Bulldog...this resulted in the return of said bulldog due to air appetite.
​There Is not much info on this question on the internet. 
My Pump is a Benjamin Pump.
Thank you 
​Dave