How Fast is the Market Moving?

How fast is the housing marketing moving right now?
On Friday a first-time buyer sent me a list of homes he wanted to see when we went out on Sunday. There were ten properties on his list. I told him ten is too many — eight is the max that stamina and sanity can endure. So he sent me three addesses to omit, in case.
I needn’t have bothered to pare down the list.
Saturday morning when I printed out the listings, all ten were Active.
Saturday afternoon when I called to make the appointments, two were under contract and one declined without giving a reason. So I added the three omitted ones back in. We had seven to see.
Saturday night late I got two messages — two more properties had gone were under contract.

Now we have five to see and I feel like we’d better hurry before there are only four or two or none left.  How fast is the housing market moving right now? It’s giving me whiplash!