I'm currently at a barn where they do the morning feed and turnout for me as long as I get everything ready the night before. In the case of self board, I've found slow feed hay nets to be a life saver. I stuff the thing with hay, they hang it on the fence when they turn her out and and she can pick at it all day. I'm going to be moving to a different barn soon but I have a friend there where we can trade off chores. I work Monday to Friday 9-4:30 and during the winter that meant I was picking my girls paddock with a head lamp.
I think a lot will depend on the horse you get, the policies at the barn and whether or not you have someone else there you trust to trade chores with. Some things to consider would be whether they might be willing to turn your horse out and feed mornings/there's someone to trade with, if the horse you get is high maintenance for feeding, ie soaking foods, complicated supplements, why type of barn set up, ie if its stall to group turnout, stall to individual turnout, paddock board, pasture board