Yup, agreed. I have the same situation about working away from home and hardening off hundreds of seedlings. Like GC said, I do it with placement instead of time.
I have a deck that gets mainly only morning sun. On the deck is a long planting bench. To start with when they first come out, I put them UNDER the bench. That way they get no direct sun and a lot of protection from wind (wind is at least as much the enemy at that point as sun, very dessicating). Still bring them in at night if the nights are chilly. After a little while of that, they can be out from under, but near the house where they get fewer hours of direct sun and still a lot of wind protection. Then they gradually move to more and more sun exposure/ less protection, by where they are placed and stay out all the time (provided no freezes). Eventually they come down off the deck to a more all day sun location.