Pete i went to Skye in March of one year and the Black Cuillin were totally out of reach in the conditions. But was still some good stuff available from Sligachan. The flattish run out to Camusanary and back would be about 15 miles and it is stunning at Camusanary.
Also going from Sligachan over to Loch Coruisk, then round the Bad Step and back via Camusanary was a good adventure, approx 20 miles if i recall.