Would extended handling of a BP be able to cause burns; what length of time would it have to be for a burn to occur?

Not sure about how long but I think extended handling could cause unhealthy body temps for the snake. Burns? I think would be more baking of internals slowly. Length of exposure that would cause heat related health issues? Not sure on that one.

Extended thought, is there any logic to think that some snakes who dislike handling might do so because of the heat of our bodies?

It is possible to be heat related but can be many reasons.

My thoughts kind of follow that if a surface temp in the cage of 94 or 95 is hot enough to cause a burn, then shouldn't humans be too hot for them when being handled for more than short periods, since we are usually close to 98 or so.

IMO do much handling would cause stress issues over to much heat.