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I just love the idea of an automatic door opener and closer, however as a cautionary tale, I thought I'd just share with you a post I read sometime back about a woman who lost one of her Mille Fleur d'Uccle roos due to hypothermia because he was a couple of minutes late coming in. He missed the closing of the door. That just breaks my heart to think about it and I'm sure it would you also. You may not have a breed quite that sensitive to the cold, but it might not be the cold that gets your bird. It sounds like that's not what you're worried about. Be sure to give them plenty of window. I would wait until a couple of minutes past dusk, maybe even going toward dark. I know some folks may feel you risk letting in the wolf, but most wolves don't prowl that early, not saying they NEVER do. I trapped one female raccoon AT dusk. She would wait until I'd go in the house from locking everybody up and then come in around the coops and rummage for chicken feed. She never bothered the chickens, but I didn't want to take any chances, I knew eventually she would. NO, I DIDN'T KILL HER. I took her for a ride to a state park about 15 mi. from here, and yes I know it's illegal. No, I didn't get caught, and I trapped her mate about 3 days later, took him down to the same place, and turned him loose.
He wasn't so easy to release.
My point being, for your absence, weigh the pros and cons. I'm sure you know your chickens best. If they are predictable as clockwork, it maybe better to lean more toward locking up early. I just wanted to give you that little bit of info so you could make a fully informed decision about when to set your timer.