The Lancashire Cycleway - a figure of 8 route that crosses in Whalley and visits the hills and plains of Lancashire. I did it over 4 days, although I only did the Northern loop as a continuous trip camping overnight at Silverdale as I live close to the bottom of the southern loop.
My mileages wereNorthern loop
Whalley to Silverdale (flat) 3445ft ascent, 78.35 miles
Silverdale to Whalley (hilly) 4136ft ascent, 50.78 milesSouthern loop
Rivington to Whalley (flat-ish) 4193ft ascent, 71.08 miles
Whalley to Rivington (hilly) 7226ft ascent, 64.26miles
There is a Cicerone Guide of the route
which I found useful for planning.