The problem with being egg bound is not about a date for example you can have a female that is 40 days POS that needs intervention because she is egg bound while a female can be at 50 days POS and be fine and lay her egg like any other females.
Keep in mind that 27 to 35 days POS is an average, not all females are textbook and it when it's really important for you to know your animals and what to expect.
How far is the first egg from the cloaca? How is she currently, perfect coil with tail in or out?
I had females go 50 days POS.
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