when is it safe to refit a toilet after tiling with porcelain?

Hi there, generally it's safe to reinstall or install after 48-72 hours of laying porcelain tiles etc.

I would say it's best to ask the tiler as it all really depends on the type of adhesive they are using and what type of floor they are laying the tiles onto. For a rapid set floor adhesive I would say your good anywhere from 6 hrs however I have know some tilers say less.

I would check on tile adhesive packaging for drying times this varies on types of adhesives used