It depends on the size.
A Tippmann 98 custom 20oz co2 tank shoots 1100 paintballs
If it is a good fill, you can expect an average of 500 - 700 shots depending on your marker.
This can vary. CO2 itself is not very consistent, and the type of marker you are using will have an effect on this. Usually you can expect around 200-250 shots.
Depending on the setting of the gun close to 200 shots. I have a 9 oz co2 tank and it usually goes for about 150 to 175.
Around 30-35 depending on the condition of your gun
No, the FPS will stay the same. The size of the tank determines how many shots you can take before you have to refill it.
alot i have an 8oz co2 tank and it lasted a 5 hour game and its still got some left
Do not disassemble your CO2 tank. If there is a problem take it to an airsmith.
A standard 20 oz will run for 800-1200 shots depending on the marker.