@Victoria576 I once mentioned to a guest after she checked in, "Your sheets are freshly clean, but I don't iron them". She said "Are you kidding? I've never ironed a sheet in my life." She wasn't some 19 year old, she was in her late forties.
Here's what I do- I actually line dry, I don't have a dryer, but if a sheet looks too wrinkly, put the fitted sheet on the mattress properly and iron it on the bed. This is a trick I learned on hosting forums and it's fast, easy and brilliant. I never would have thought of it.
Then I put the top sheet on and only iron the parts that are looking really scrunchy, and the top of the sheet that folds down over the covers.
Unless you're running some luxury, expensive listing, just do touch up ironing if you think it necessary. I've read a ton of guest reviews, and even in the ones that are filled with complaints, I've never read a complaint about non-ironed sheets.