It all depends on the snake it self. Some will take a f/t right away some take weeks maybe months to convert them. One of my girls was on live rats. I was trying to convert her to f/t with no luck. Well, when I was gone for the week I had my mom take care of my snakes. She mistook her for one of my other snakes. And she tried to feed her a f/t and she took it! It took about two months and we ended up switching her by accident. But the point is, it's really hard to tell if a snake will convert to f/t. Some are really picky, some aren't. Just don't give up. Hope this helps!