Isn't he violating the agreement if he only stays a few? Maybe something to talk to your lawyer about so you can get more specific language to help yourself not wait around all afternoon for a no-show or a few minute visit...
I did talk to my attorney awhile back about the coming and staying only minutes and he said for me just to write it down for the future if/when he takes me back to court for unsupervised time to show that his isn't really that interested in her if he stays minutes. He told me not to say anything to exh so he won't change anything. I guess it makes him look pretty bad.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!