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Longest span is 3m for the triple bifold door.
Having a flitch beam means I can have a decent height doorway, without fear of sagging over time, and the steel flatbar frame (as recommended by the door manufacturers) means that the expansion and contraction of the building won't effect the doors at all.
Having a full 5.5m width beam simplifies construction.
NotThamesWater
6 metres is srs bsnz - what's your longest continuous span? I cheated and made two halves of the shed, and then fixed them together. Basically two c. 2m x 2m x 2m cubes screwed together to make a 4m x 2m footprint.