Tough one, cw. As long as you don't have to rearrange anything, I think I'd be flexible. But, seeing as you know he is keeping track of his time, I think it would behoove you to keeps track of the times you have to changed things to accomodate him. In the end, maybe it makes both of you look good, which isn't a terrible thing. It could be seen as responsible cooperation, which might help you in the long run.
