The have been questions about egg viability/hatching times that Steve W. and I will try to address for you.
Normal incubation period is about 35 days, although a few sources say longer, up to 45. We think that the cold weather during incubation can have an effect on the eggs that could add several days onto the normal incubation period. This could explain why we don't have another hatch yet. We have likely exceeded the time period that we saw a hatch last year.
With that in mind, the days are ticking off, and we think if we do not see a hatch by the end of the weekend, we may be facing egg viability problems.
Bent says this:
"...He gives the period of incubation as 34 to 35 days under normal conditions, though interrupted incubation may require a somewhat longer time. "
Let's wait and see.