You thought W5R3 was the biggie? Think again. Week 4 was the biggest increase in the programme as shown in the graph I've put together. And Week 6 is quite big as well... but y'all focus on that dreaded W5R3 dontcha?
How to read this graph: Take Run #15 (see x-axis) - your beloved W5R3. You can see that the Cumulative Running time (right hand side y-axis) after you've done W5R3 is 177 minutes, while the left-hand-side y-axis shows the infamous 20 minute running time.
I think this nicely illustrates how Weeks 1-3 are the foundation weeks or a 'road' leading up to the 'bridge' of Weeks 4-6 that get you to the remaining road of Weeks 7-9 (the home straight).
So by the time you come to our beloved W5R3, you have 157 mins of running under your belt - over 2.5 hrs to prepare you for your lovely 20 mins!
Yours in data heaven,
John