So, once the Queen has enough warriors to help construct a hive, she goes into hiding within the hive and matures, thus she becomes full-grown, produces an egg-sac and starts to produce the hundreds to thousands of eggs, which do the process at a slightly slower pace, but at a much grander scale. Now, when the Queen is running around "regurgitating" the embryos, I think the process of the embryo being created inside of her will be faster than a facehugger, but the time in between the creation of the embryos will probably not be in a matter of minutes, but certainly not as long as human pregancy, for example. Ok, so again, the Queen quickly creates enough Alien warriors to protect her/create a hive for her to hide in and grow and egg sac. This is a survival tactic that makes sense. This method is far more quicker than a human being turned into an Alien egg, which in my opinion, conflicts the idea of a Queen anyway. The Queen is the ONLY one that should produce the eggs.