Fx 4 stage hand pump

For me being a 17 year old I found that the 3 stage got very warm after about 3 minutes and 30 seconds. I was able to fill my wildcat from 150 to 230 bar in that time frame constitanty. I would suggest stopping when it begins to get warm. 

I would also say that you are going to end up with a SCBA tank if you are actually serious. I would just spend the additional money and get the tank to begin with. I lost the same amount of money on my 3 stage pump as I did selling my wildcat. I would suggest getting a used one off of this forum or another one. I am a fan of used stuff like that.