o.k. i screwed up. i have 3 acres being over run with weeds. i sprayed weed be gone max not thinking about my chickens ( the bottle says safe for pets and people after it dries) i made some calls and found out that chickens are not pets or people and could possibly harm them. i heard to keep them locked up for up to a year? question is how long to keep them locked up and is there anything i can do to fix my silly mistake?