did it twice many years ago, once over 2 days to test the route and once in 1 day for the actual charity event
left ‘pool at 5am, got to leeds about 8pm with reasonably fit riders but there were others who took much longer (18hrs for the last guy through, unfit but carrying lots of food/water/lights cos he knew it would be hard)
one lad did it on skinny tyres…said it hurt a bit but was do-able (except when he slipped and fell in). If you make it in 12 hrs on skinny wheels then thats some going if you’re even of reasonable fitness, especially between Barnoldswick and Silsden (no path to speak of whatsover – just grass and uneven muddy tracks)
there’s no path going through Burnley – you have to come off and find your way back onto the canal again (not easy if you’ve not done it before) and also at the Foulridge tunnel, but thats signposted