Don't count on one job to go through, continue looking at other places for employment. As for length of time after an interview, give it 5-7 business days as that is the fair time frame for most interviews. In most cases, business owners are pretty good at getting back in touch with the person they have interviewed if they are interested at hiring them for a position that is in need. I would be a little patient on this but as said, I would also keep looking just to keep things open. Wishing you the very best of luck!