I had a few hens still laying when they were at the end of their molt and the river of eggs were drying up. I got one egg one day and put it in the incubator thnking "what a neat trick it would be to just add one a day and hatch one a day for a while". Well, that was to be the last egg for several weeks and the poor lonesome thing has sat in the incubator alone. I candled it at 1 week and it was moving, and progressing, though slower than I thought it should. Back to the bator and continue to turn. Week two, still really floating in liquid and not really formed.....but alas...certain movement. Ok, back you go. Day 21 came and went. I candled it at day 21...it was super wet..floating still....but very distinct movement. I got witnesses to be sure my eyes weren't fooling me. Now we are on day 23 and the egg is dry. The air pocket is there. It looks like a day 20 egg. It is still moving, though not vigorously. It has begun to get tight in there. I have never seen an egg go past 21 days. Most start pipping on day 20. I have since had another egg laid(days ago) and have added it to the bator, but for the most part, this little guy is alone. Has anyone had any experiences with eggs going this long? It has a small chance of being a guinea fowl or a guin-hen egg....do they run longer? Any thoughts?