Definitely, but if it's bad enough for 3 hours, then 12 hours for the whole thing is looking very tough! It's got to be the quickest quarter of the route (just a smidge more than). The worst sections, I reckon, will be up to and down from Sticks Pass and Grisedale Tarn, so time will almost certainly be lost there. If the outward journey to Patterdale takes three hours, I guess it's safe to assume the return journey to Askham will take more (more knackered and more climb).