I know the pain of just wanting to get it done - that was me last summer. Unfortunately my policy is to wait till I have someone else shows interest so I keep advertising. I have found in the past that pestering so to speak someone that even if they signed never seemed to settle in as if they were not ready to commit but felt pressured and always wondering what they missed out on. I no longer chase families. I do tell them this at the interview reminding them again at the end saying ok well try to get back to me one way or the other as soon as you can and if another family interviews and takes the space in the meantime I will let you know. That somewhat gives them a scare or at least something to ponder as they leave. Then if it happens in the next two weeks I do let them know but any longer just assume they weren't interested anyways and just didn't let me know.