I've only done it once to get a picture size comparison between my adult and young BP. It was probably 30 seconds max, so neither really reacted. I wanted to picture for when they're both adults I can get a similar growth comparison picture.
None of my other species are large enough that I'd be comfortable setting them down on the floor just yet, other snake or no. The adult BP, maybe the younger one, are the only ones slow and big enough.
When Noodle hits a couple hundred grams, I'd consider him with one of the BPs under the same situation.. hands hovering, under a minute, as a photo op.
With similarly sized snakes, I doubt that short of a time is going to be a problem for non-snake-eaters. I dont see much point in anything longer based on how little reaction I saw to the other snake, positive or negative. It was like they registered contact and acted like it was environmental, like a hide or rock or plant.
Obi (spider) basically said, look a shadow! And moved that way.. Vega (banana) froze and acted invisible like he usually does when set on open ground. He got moved over to relax some while I put Obi back in his cage after the picture, which he did after a few minutes like usual.
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