One as long as what you're making at least. I improvised for longer ones, I use a section of closet wire shelving each space measure 1" width .
You could use the back of a chair or a hook on a wall. Both methods work well for belts, leashes, or anything that is longer than a bracelet. I used my jig to make lanyards but if I ever make another one I'm using the back of a chair.