I've got a darkroom, and I've loaded up to 11x14" paper into my home-made pinhole suitcase.
But then I went down to the shack and took a shot, but I wanted to take another one. Didn't even wait until night, just drew the curtains and shut the door, put myself in between the cracks of light coming around the curtains and the paper, and just worked fast. Open suitcase, pull out paper, put in Jobo drum, close lid, open packet of paper, put in suitcase, stickytape on, close lid, less than 30s overall.
Of course, paper is a lot slower than film. But if you're using film anything smaller than 8x10, then a $5 darkbag will be big enough.