I added my eggs on the 7th around 4-5p.m. What I am wondering on day 21 will it start day 21 at 4-5p.m? when I added my eggs on the 7th I counted the next day at 4-5p.m. as day 1. Any advice? cause today they would be on day 19 but would this be the begining of day 19 or the end?