How many of us like to be kept waiting? I've never met anyone who did.
It has become fashionable lately to state on wedding invitations a start time, which is actually considerably different to the actual start time. On the face of it, it sounds like a good idea; after all, we don't all have good time-keeping skills and if guests have arrived in advance of the ceremony time then they won't miss the ceremony, or will they? Perhaps they were intending to miss the ceremony anyway and just turn up at the reception?