I would let them settle in for a week with on absolutely required handling for cleaning, that's it. After that week, you could handle them every day or every couple days if they are a more defensive/aggressive snake. I just normally recommend people "read" their snakes behavior and figure out themselves how often the snake should be handled.

You should wait two days after feeding so that the snake can calm down and digest their meal. Other than that, you can hold them as much as you want!