I have a similar problem at my church(formerly UU, now non denominatinal liberal). The woman in charge of character school(our sunday school) wants me to help out for 5 straight weeks- I'm like"No way, not happening, here's what I will do". I remade the schedule so that it was two weeks on, two weeks off. Now, she's insisting that we "talk" about it. I committed 5 weeks between now and December- just not in a row. She can take it or I'm not giving any weeks