However you do it, you should seal every joint. Around the lensboard, bellows frames, film holder, removable back, holder light trap. I’ve never done anything in the range of what you’re talking about, but regularly do 1 hr exposures. I used to use a chamonix with wide angle bellows(the bellows material is completely light tight, btw), but always tape every joint - considering the time I put into each picture it seems like good insurance to me. I’ve yet to receive my new camera, but hope it’s as light tight! And I never covered the bellows/camera with a dark cloth - I’d be more worried about the vibration it could add(although would be a great solution in non-windy environments).
Vibration is another problem you’ll have - I use an aluminum gitzo 5 series with a majestic head and a couple sand bags for good measure...
Good luck!
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