Day trips suck in many ways.

1. I joined this line of work to see new cities and places, AWAY from the airport. See some local sights, try a new restaurant. Not the food court of an airport, haul ass to the gate, and depart again. "Chick Fil A is near our gate, haul ass bro, I got the preflight"

2. Driving on a daily basis to/from the airport turns it into a 9 to 5 job. traffic, commute, park the car, unpark the car, shuttle van, gas, etc.

3. Four of five back to back one day trips is arguably "more labor intensive" than just a regular four day. Hop in the plane, come back 4 days later, done.

etc etc

I think 3 days are perfect, especially if you leave late on Day-1 (basically have all that morning and some of the after noon off). Those are really just 2.5 day trips