BarryP Offseason plan?

I have no idea the answer to your question but rumor has it that BarryP himself is very good at/about answering questions about his plan. I would PM him directly (on that other site) and see what the man himself says.

What you do in the off-season should depend on your goals and constraints.

However, I would say the two things to maintain focus on are consistency and frequency. Work on those, and volume will naturally starting working upwards. As for how much to add, or where to top out at, this is where goals and constraints come into play. If you can't run every day, and can only run for an hour or so most days, then that's what you work up to. If you can run twice a day almost every day, and have the opportunity to run for two hours once a week, and maybe 90 minutes another day, then work to that level.

well that is where is hard to define for me too, i think i have the time to do it. But how much should I go up and where am i going to stop making progress, is where i am confused.

If you have the time/ability to keep going up for a while, doesn't that sort of answer your question right there? As far as where you'll stop seeing gains, i'm guessing somewhere way over the miles you'll probably be able to put in and years down the road.