This is a much slower process than I thought. Had two around 10 am yesterday. Had a number of pips during the day, but nothing out of the shell as of 10 last night. Went out at 5 this morning and 3 more were out with one about to blow the lid. So far there's 3 OE's and 2 Marans. The one about to hatch is also a Marans. That leaves 21 more eggs to go. We all know how my Saturday will be spent. 
