In reply to Owen W-G:
1 pitch is definitely the way to climb Darius, and twin 50's will work fine....
....but you will first need to pre-rig an extra belay rope from a substantial tree 30 or 40ft back from the lip, so you can clip into it as soon as you top out.
I always to do this for all the long pitches in this area (Darius, Perseus etc) and it saves a load of hassle.
If this is impractical, then you'd be best off treating it as a 2 pitch route, but if you approach the crag from the top (which I normally do) then the pre-rigged belay rope works a treat.
Neil