Last year I bought a retractable clothesline cord for 10 bucks to air dry my laundry instead of paying 2 dollars each time I used the dryer! How much did I save? Probably less than $50. Was it worth it? Nah! I had to spend a lot more time dealing with my laundry.
Poor people spend time to save money but rich people spend money to save time.

To answer your question, probably 7.