I would say it shouldn't take 3 days to hatch once pipped. I would probably wait a little long though. What day are you on? I had a silkie pip while in the turner Wednesday, it was pipped way down low on the egg. I removed the turner and placed egg in hatcher, thought it was goner for sure yesterday morning, later that night it had moved its way back into the right position and started to pip again up a little higher, I did eventually help it out, after it appeared to be having trouble half way through the zipping. Two others that had started pipping at the same time had hatched way before. No other eggs are showing signs of pipping either or I won't have helped it. The chick is now resting I hope to move them to a brooder in the AM.
Good Luck hopefully it will start to zip soon. Pip to zip should take less then 48 hours and that's being way to generous, should be just around 24 hours