Hmm ... lemme think, so as to be able (we can only hope) to clarify what I'm trying to say, YRG.
The overlapping has been done
when changing to the new ball. That is the method I've adopted for this continuous garment.
My question was to do with each end of the two overlapped balls: how long should I leave 'em at the back of the knitting?
Have I only confused things further ...?