How long does it take for a dinosaur egg to grow?

I'm curious, how long does the process of a dinosaur egg growing and developing actually take? Is there a specific timeline that scientists have observed or is it a variable process depending on the species of dinosaur? Are there any external factors that can impact the growth rate, or is it solely dependent on the internal biology of the egg? I'm intrigued to know more about this fascinating aspect of paleontology.