how long til a hen is clean
How long after a hen has been with one rooster does it take her to be clean so to breed her to another rooster? How long does the sperm stay fertile inside a hen?
Harris County Texas poultry
Although there have been instances when sperm can last a bit longer, usually a week to ten days is long enough to wait.
If both roosters are the same breed and variety (so you couldn't notice a difference in the chicks,) I would probably wait 2 weeks, just to be sure.
Good luck with the breeding season!