After two years at Weber, Marriott felt it was time for him to transfer to the University of Utah. To earn money for tuition, he took a job selling woolen underwear to lumberjacks in the Pacific Northwest. During Marriott's senior year at the University of Utah, an A&W root beer stand opened in Salt Lake City. Impressed by its success and remembering his experience as a missionary, Marriott purchased the Washington-area A&W franchise.
Feathers are 85% protein so when birds moult, replacing their feathers, laying hens will usually stop producing eggs. Eggs are made up mainly of protein and it is too much for a hen to produce new feathers as well as eggs. Pure breeds usually take longer to moult than hybrid hens. Occasionally hens will lay the odd egg during the moult but most will take a break. When a hen is going to moult, her plumage will take on a very dull appearance. It normally takes about 6 weeks for a young healthy pure breed hen to complete a moult.
So there really isn't a set time for getting their flight feathers back. They all don't grow back at the same time because they all don't molt at the same time. If they did, the bird would lose all of it's flight feathers at the same time and wouldn't be able to fly. This would be fatal in the wild. For future trims, you should take a note of how many flight feathers were cut and their cut length. Both of these factors can be changed to allow better flight.