At the end of the day, I try for a speed lap of under 1 hr of cart ball with 4 or 6 Y.O. child in tow. This round can take longer if the kid(s) are cranky or the course has a few groups.
In the A.M., 2:30 with a caddy in a twosome - all business.
Personaly, I like the end of the day, with or without the kid(s). The sunset is great, and I feel as if I have accomplished something worthwhile, whether I get the full 18 in or not.
JWK