I usually set the expire date accordingly to how long I am fine with it being out there. I rarely revoke an offer unless I change gears or want to sent out other offers that would cause issues if both are accepted at the same time.How many days do wait before revoking an offer? Unless it was a mistake, I usually will let the trade offer sit between 3 to 5 days. I figure that is long enough to let someone think on it, otherwise they weren’t interested to begin with and didn’t care to reject it.
At this time of year my dynasty league has a variety of times people start getting into the season. Because of this I don't necessarily revoke because sometimes guys aren't quite ready to start focusing on the season yet. I don't understand why not but to each their own.