Thanks all for your advice. The leaves were starting to wilt last night, so I took rafed and leon's suggestion to cut all but the distal 3 leaves.
It looks strange with the leaf stems sticking out, but the remaining leaves look happy :-)
jds - since those stems grew so much, I have plans to air layer the 2 side branches when they're ready, probably next year unless they decide to grow like bonkers over the next month or so. But I agree it would have made a nice bush had I done so!