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@A_EF
Are you using it with just one chain ring yes? If so are you putting it on the inside or outside of the spider... that will affect what length BB you need. Sometimes cranks intended to be used as doubles hit the chain stays if you use a short BB and try to put the chain ring on the outside of the spider to get correct chain line, so you have to put the chain ring on the inside of the spider and compensate with a slightly longer BB.
First things first, do you know what chain line your hub gives you? Probably around 42mm?
If you're able to work BB length out roughly then I would always err on the side of going a couple of mm short rather than long. Easeir to space it out with 1 or 2mm of spacers to get good chain line than it is if it's too long and you have to space out the sprocket on the wheel (which is tricky and sometimes not possible with limited thread width on your hub).