How late can eggs be to hatch?

[GemmyLou]

My 20+ eggs hit 60 days on saturday the 23rd of april.. how late could they go over?
They have started to change shape, gone pointy and bulging in places.. which is what the first clutch did.. i got 21 out of 26 on the first clutch..is the shape changing normal?

 

[Bill]

we average around 70 days

 

[GemmyLou]

Is the shape changing all part of it?

 

[Bill]

ours just get larger whats your humidity.can you post a pic?

 

[GemmyLou]

Ours has got larger,plump and pearly White still! They just started getting pointy! Our first clutch did the same! We did candle a few and they have moving shadows and veins! I can't upload a pic yet a not on my own laptop!