24-48 hours is fine as a general rule of thumb but I guess that depends on what you consider handling. I have no issue handling any of my animals shortly after feeding as long as it's for very short periods of time, ie: cage cleaning or something of that sort. But I used to do a lot of educational reptile shows where I was going to be handling animals in a public setting for as much as an hour at a time and I wouldn't take out any animals that had eaten that week. When I knew that a show was coming up I'd skip feeding the ones that I was planning on taking with me.