easily possible in a day, I did the Dongara to Geraldton downwinder which is roughly 60k's. All done and dusted in about 2 hours. Unsupported, solo, spur of the moment trip, wouldn't think twice about the perth to lanno run. I was strapless on a SB, found my front foot got sore from rubbing on the deckpad, if was gong again for a longer distance i would wear booties to look after my sensitive feet.