Did it! 20minutes no-stop. If you'd told me I'd be doing this 5 weeks ago....
Two things amaze me about this programme a) that the increments are just right and constantly challenge and progress you; and b) I've kept at it, getting up at 6 to go before work for two of my three runs each week.
Usually a lurker on here, but this forum has been a great source of info and reassurance