The only pitch requiring 90m is Gaping Gill (which if you don't have a long enough single rope can be done with two 55m down Jib Tunnel), the only requiring 75/80m is Boxhead (both routes run parallel & one is now given as 45+35[+30]m).
All the other 70m+ rope lengths can be divided into shorter pitches, although the CNCC topos unfortunately don't show the separate pitch lengths to allow a more accurate guess as to what they can be split into.
Rather than 90m, Meregill is given as 55+30m & Long Kin East 55+35m in the latest topos.
Of the other 80m, Brown Hill is now shown as 40+40m, Hunt, Alum, Nick & Death's Head can also be split.
All the 70m (Little Hull, Diccan, Ireby, Long Kin West, Jingling, Rowten & Big Meanie) can as well.
The only cave in the list requiring more than two x 10m lengths is Simpson's, but of course that is only if you're going back out the same way.
& the only duplicate entry I noticed was the entrance of Notts Pot (20+15m).
Mike