Ha! Jasper aka the Steve McQueen of cockers...
Just measured mine - 90cm. Never had probs, but then that's probably because (a) I don't think it's ever occurred to Jack and if it has then (b) he can't be *rsed, which sounds about right. Intended to get rid of it after the puppy stage and it's open pretty much all the time but it does come in useful from both directions from time to time so it's still up...