Without knowing what the humidity was it would be hard to know. Mine stayed about 50 humidity wise for the duration. I got it up a bit during the last day as I didn't want sticky chicks. They all hatched well. Will know how my hen eggs do on Friday when they should hatch.
I had 2 or 3 on day 17, a huge hatch on day 18 and a few stragglers today on day 19. Todays chicks aren't quite as thrifty as the previous two days. Oh, I hatched 150 chicks in total.