At a set tractor engine rpm, your pump will produce a certain amount of fluid flow in GPM's
How much flow to any hyd component depends on how you apply the valve lever.
To verify if your tractor is putting out the stated GPM's, have a hyd shop do a flow and pressure check.
To verify the flow yourself, get a 5 gal bucket and remove one of the cyl hose and place it in the 5 gal bucket, marked off in 1 gal increments.
Start tractor and push lever to max for 6 sec.
If your tractor has a 10 GPM pump flow, you should see fluid at the 1 gal line.
If your tractor has 8 GPm flow rate, then you should see 1 gal in 7.5 sec
You can do this in a 1 gal jug also.