Some places specify if a couple, each work 24 hours and if a single, he/she works 32 hours a week for the same site. This is typical, though the hours may vary in both situations. If he's just working for a free site, he may want to consider getting a part time job at Walmart, Lowes, etc. and renting a site long term. Do the math and you will find out you will probably come out ahead doing it that way.