Okay Hop3y. Here's one which is 23 miles long and takes in some lovely countryside. The cafe at Coldwell Activity Centre is well worth calling in at after 17.5 miles.
I started and finished the loop on the A682 near the college in Burnley. I'm sure you can find your way there. Head towards Colne but turn left after about 3/4 mile and climb to the village of Fence. My route does a little tour of the Forest of Pendle through Newchurch-in-Pendle and Roughlee to Blacko, then round behind Colne to Laneshaw Bridge. Follow a nice little lane to Trawden and up to Clarion House crossroads. Turn left there and whizz down to Coldwell Activity Centre which is well worth a stop if you are hungry, thirsty and tired by then (as you may well be). You climb a bit from the cafe stop, but after that you have 5 miles or so to get back to where you started from and most of that is downhill!
It's a nice circuit, but don't do it when there is any chance of ice on the roads because some of them are very steep, narrow and sheltered from the sun. If black ice is anywhere in the area, it would be on this route!
Here it is on Bikely -
A scenic loop from Burnley
Let us know how you get on!