I dont know what your time schedule is overall but found it easier to make up distance later in the walk rather than earlier on. For instance, I walked from Hardraw to Baldersdale YH in one day and it is probably the majority of people who walk from Byrness to Kirk Yetholm in one day.
Edale to Crowden is roughish terrain and probably enough for most people on day 1. For me, if I do a really long distance one day, I am probably knackered for the next and the distance I cover is limited, so overall I am probably not doing much more mileage than if I had walked two moderate days.