I've tried the afternoon sessions as one of the days is on the week-end, less days off.
I prefer the regular days though as it's more spaced out. If you do the math, you do get similar minutes on track but realistically you get more during the regular daytime sessions and you get daylight as well. It's interesting to be running as the sun sets.
I would suggest that you join me on July 1 & 2, given that July 1 is a holiday for us Canucks, we only need to take off 1 day of vacation.