when the slave goes bad, you will notice it will leak where the piston comes out. you can have one of a few issues. Clutch bleeding takes a while without vacuum. like i think i took me 4 hours. it helps to tie a string to the clutch pedal to pull it back up. now, things to check first
Grab your clutch fork, and try to push it with your hand, if it doesnt move, or moves very little, you likely installed it correctly
Where the clutch pedal pushes the hydraulic rod into the master (under the dash) if its damp, or looks like its covered in grease, its leaking, and it is bad.
check the line between the master, and the slave for any type of moisture or leaks.
check the piston on the slave cylinder. 9/10 times, they have a slight dampness, if its in excess at all, its likely bad.
Are you getting fluid to come out of the slave?
BTW you dont need to pump 20 times, try this
1) clutch pedal up, bleeder closed.
2) clutch pedal down
3) open bleeder
4) close bleeder
5) pull clutch pedal up
do this until you get fluid coming out of the slave.
at this point, you should have pedal pressure.
if not, check to see if the slave is pushing on the clutch fork.