Our officiant does not have a fee, but asks for an appropriate donation. I am looking to pay him a fair and honest rate for his time. We are having a smallish (<90 guest) laid-back wedding. We don't want the ceremony to last for more than 15 min - 20 tops. I'm not sure if any of that info matters, but would love to know what a fair rate would be for his time. He does list a donation guide on his email, but only mentions typical donation rates for OOT weddings. Any advice?