My concept is to have a few (2-3) hens and to incubate their eggs. I understand eggs will keep for about a week before needing incubated. So if I'm wanting to hatch out most of the eggs these hens lay, I'm looking at maybe 10-15 eggs per week. Most of the things I've read on incubating is all in/all out (put a batch in, go through the 21 day process and start over) procedure. If I want to hatch a small batch weekly, do I need 4 incubators? That seems a bit pricey on start up. Is there an economical incubator that I can basically run all the time and each week hatch out a batch and reload a new batch?