An acre might be low, five acres might be high. Depends a lot on what the local conditions are like, what you can grow, what tools you have.

I keep bees, for instance, and my hives produce about 50-100lbs of honey per year. It's not super nutritious, but it's low effort per lb. Ten hives could produce a lot of raw calories. But it's also a skill, and you can kill your bees if you aren't careful.

The point I'm making is that, we're all bringing different skills and backgrounds. I've grown potatoes but never at the scale of an acre. I don't know what challenges that brings.