Buy wrinkle free shirts unless you're an Olympic ironing champion.
My mom can iron a shirt in 3 minutes. I can iron a shirt in 15. It would be unrealistic for me to schedule one hour to iron 10 shirts. It would be more than enough time for my mom. So if I need 10 unwrinkled shirts, it's probably a better use of my time and money to buy wrinkle-free shirts. I would spend a little more time and perhaps money buying the shirts, but would save myself many hours by not needing to iron them as much.