From Longman Dictionary of Contemporary Englishsomething is wearing thinsomething is wearing thina) if something is wearing thin, you are bored with it because it is not interesting anymore, or has become annoying The film begins well but the joke wears thin after about ten minutes. b) if your patience is wearing thin, you have very little left, because of a delay or problem → wear
Examples from the Corpus
joke wears thin• It has its moments but the joke wears thin after about ten minutes and the final hour is boring and pathetic. 