I've used a variety of pet sitters in the 25 plus years I've had a cat, but the longest has probably been slightly over 3 weeks. I found my latest pet sitter through my vet's office where she worked as a vet tech (since the cat I had at that time needed daily medicine). I've also never worried about people having access to my house/valuables, probably because I don't own anything too valuable, and I've found my sitters through referrals from people that I trusted.