2017
Day 1: 13.5 hours riding (of which 2 hrs at stops/eating)
Night 1: Stopped 6 hours, sleeping 5
Day 2: 17 hours riding (of which 3 hrs at stops/eating)
Night 2: Stopped 6 hours, sleeping 4
Day 3: 15 hours riding (of which 3 hrs at stops/eating)
Night 3: Stopped 7 hours, sleeping 6
Day 4: 17 hours riding (of which 3 hrs at stops/eating)
Night 4: Stopped 9 hours, sleeping 7
Day 5: 16 hours riding (of which 4 hrs at stops/eating)
Finished in 106 hours: riding time: 64 hours: 22 hours kip.
I didn't "rest" except when sleeping: the stops every few hours during the day controls at were to eat and fill bottles. 22 hours sleepover 4 nights is not 'so little sleep' and so my ride was entirely 'manageable'

. Average moving speed about 22kph, but a lot faster on Day 1 and a lot less for 8 hours of Day 5 (into a serious head/half-side wind across the shelterless flats south from Louth to St Ives).