Our reception was just 4 hours, and it went by FAST. We did a lot of dancing vs. any games though. I think it really depends on your guests, and what sort of celebration YOU want.
I think a game in the middle may have been a good break from the dancing. The one I like is the shoe game - the bride & groom have 1 of their own shoes, and 1 of the other's shoes. They are sitting back to back so they can't see the other's answer. Someone reads off statements, and then the bride & groom hold up the shoe as their answer of which one of them fits the statement best. The statements should be written by a close friend or family member - and kept "secret" from the B&G.
The statements can be funny like "most likely to leave the toothpaste uncapped", or "most likely to leave a dirty cup in the sink", or more risque or whatever best fits the couple.
HTH! Happy planning!