sugarp:I used to give showers on Sundays, but these days with so many of my friends having out of town guests, I like to have the shower on Saturdays so people can get in, relax, and have an extra day to leave.
That's how my family is - need a day of rest before the work week. DH's family insists on Sunday, so I ended up with two different days. :-)
We always have showers around 1-2 pm on a Sunday and they are not "strenuous" for the guests so no real need to relax. lol They only last no more than 3 hours so they are able to drive home. We don't have any that come less than 5 hours away though...and most come from between 1 1/2 - 3 hours.
Personally, I prefer Sunday showers. We do other things (family things) on Saturdays (go to movies, lunch or dinner out, kiddie programs and parties, etc). Sundays are church and then whatever (so I am almost always free on a Sunday afternoon).