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@mikec
About as long as it takes to roll down the hill.
My aim is to get up the hill at about 100 rpm which will be a steady 18mph and roll back down at the same pace, recovering and then hit it again. Will probably take about 50 seconds to get up it and the same back down. Hope to be able to do at least 5 first off before I really flag. If I do flag too much then I may reduce the gearing a little