I would agree with Bill - people, especially older people, won't dance to more than a song or two at a time, and life ain't a disco anyway. I might chain two songs together if it looks like people will dance to them (fast or slow) but I purposely allow some breathing room between songs. This allows people to come up and make requests too.

And yes, people are different depending on the region they are from - people from New Jersey talk too fast and they have to slow that down some once they get to South Carolina.