It seems as though you are mixing up maternal incubation times and, actual incubation times.
If you are incubating eggs at 88F-89F , they should hatch in a window of 54-60 days.

You are incubating them right? at what temperature?
When where these eggs laid?
Did you candle them to make sure they a Fertile?

You can cut on day 55 if you want, they MUST have been incubated at 89F for 55 day