I've done it twice in a day, once in winter solo and once in summer with a mate. First thing is, its a lot rougher than you think and at a 128 miles a lot further. The section from Bingley to Skipton is bad, its heavily rutted and progress can be painfully slow. If its been raining for a week or so then mud will be your biggest problem. I came off 3 times in the space of 20 miles and was lucky not to end up in the canal. Going through the built up areas the toe paths tend to be good, but in the remote bits expect long grass with a very narrow line through it or mud and more mud. I've done it on a rigid singlespeed and a geared hardtail, if I was doing it again I'd go with the hardtail. Tyres are critical, if the weathers been bad prior to the ride you'll want someething with plenty of grip, if its been dry semi slicks are fine, though a bit of volume will make for a more comfortable ride. I have only done it Leeds to Liverpool, doing it in this direction gets the roughest sections out the way while you are still fairly fresh. The Liverpool end isnt as scary as people are making out and over the last 10 miles the toepath is very fast.In the dry I made it in just over 11 1/2 hours with lunch and a late pub stop, but the winter trip was close to 15 hours with the last 6 in total darkness. Its a great day out and you feel like youve achieved something at the end of it. Hoping to do it again this year, but will definately leave it for after a prolonged dry spell.