In June, we checked into both BCV and then VB by 6PM, when we arrived. Our rooms were ready and clean and well equiped. Also each room was wonderfully situated for us even though we didn't have any special requests.
Bobbi
PS. Our only experience of getting a room late, after 4PM when we had actually checked in earlier was for our first Grand Gathering. This was our first major use of DVC points, and we had 5 rooms, and the main one, our 2 bedroom wasn't ready before 6, and we had dinner ressies at 6. It was a busy DVC time, December, and a Sunday to boot. I worried a bit about the rest of the services, but in the end, that late start wasn't ever given another thought until right now.