Check out the video Notes on doing 100km. I am Slow but Steady, my cruising speed is kph, but when you account for snack breaks, looking at maps, posting on social media and stopping and sighing that becomes 6. If I did 100k at that speed, you are looking at the best part of 17 hours, which is not a pleasant thought. Tidal assistance is required to make the task more palatable, which dictates a maximum of 12 hours for a there and back, +/-2 hours. Where better to get tidal assistance than the mighty Severn Estuary. To complicate matters I wanted to go under the two bridges and paddle around the islands Flatholm and Steepholm, which meant doing the 4km crossing between the two at slack tide. Everything lined up perfectly, high tide at the Severn bridge was at 9am a very civilised start time, the distance to Steepholm was a convenient 45km and the weather was sublime. I could have delayed my start by an hour to get better tidal assistance but the need to have some contingency won out. I ...