Curious as to how long a chick could go between internal pipping and external pipping. I know it isn't an exact number, but approximately how long can the process of pipping take before the chick breaks through the shell? I'm asking because the eggs I have incubating are known to have thick shells, and the temp/humidity hasn't been very reliable through incubation. As of right now I have one that internally pipped a little over six hours ago. I am wondering if I will need to intervene via 'Artificial Pip' just so that s/he can breathe. At the moment it is still moving and making noise, but definitely a bit quieter than this morning. Thoughts?