In reply to Fiend:
40 mins is closer to the mark. Varying susceptability to seepage, I think some of the grooves would stay damp. It's tucked under Helvellyn so not going to get any sun until at least midday.
Suntraps would include: Black Crag on Pike o' Blisco but could be a bit chilly if there's any breeze. Buckbarrow, Wasdale is quick drying and the main crag is only ten minutes up the fell side.
ALC