Faced with time pressures myself, on a Camino in 2011, I elected to start in SJPdP and end where I could.
As with any camino I met friends along the way. We exchanged FaceBook accounts. It was quite grand for those 16 days.
But then I had to catch a flight home, around Leon, so I departed.
I came home to work and the usual day to day, and watched on FB as they continued the journey. It was torture. I watched them complete what we set out to do, but I wasn't there.
I have never since done a Camino where I did not at least make it to Santiago. Just to feel the sense of accomplishment, the camaraderie with those I have met along the way.
I know this topic comes up again and again, but my advice is to pick a spot to start where you can make it to at least SDC and walk it continuously, not ferrying ahead and losing friends met. In fact, I would prefer to pick a spot where you can make it beyond, to Finn and Muxia if possible. 3 weeks is a long time to walk...
In my opinion a Camino without closure, reaching some middle destination only, is not as happy as a camino closing reaching a common goal.
Again, there are many opinions on this, and I admire those with the discipline to walk one year, stop, and then the next to continue a journey to the destination.
I'd rather walk a year and make it, and then figure out how I can walk longer distances with either more time, or more stamina, on subsequent ways.
Damien