Hello, A week ago, a lawn company came and sprayed my lawn with a flea and tick treatment while I was not home. It was intended for my neighbor. My 5 chickens had been free ranging for around 4 hours between the time the lawn was sprayed and when I got home and put them away. I kept them off the lawn for 36 hours after that. I've been keeping an eye on them and they don't seem to have suffered any ill effects. My question is - how long should I wait before consuming the eggs?