I asked my colleague to have a look, this is his response, he is a 2h 31m marathon runner:
Difficult subject for me to cover with regards to run duration as despite being a qualified coach I have to admit to being more focused and tuned into my own training. That said, the overall mileage of midweek runs does seem low… the plan appears to ‘peak’ with a week of 2x 3mile runs, 1x 6mile run, 1x20mi run, so >60% of the mileage is completed in the long run alone.
For me, I would expect to see the 3mi runs up around the 6mi mark, (ramping up a lot quicker than the Sunday long run), and the ‘medium’ run building to 10mi+ (rather than 6mi)
I would forget trying to train by HRM – a blunt/brash statement admittedly but so many variables to consider its not (IMO) worth the investment in time to understand and plan it all, given your goal and timescale.
I would also forget doing any speedwork/intervals for this level of athlete – the marathon for this guy will be purely a test of endurance and stamina and thus his focus should be entirely on building his aerobic capacity – speedwork and improving his anaerobic system will have little benefit on his marathon performance… he would benefit a lot more aerobically from a 30min steady run than 30mins of intervals/rest
If time allows, a rest day after the long run day would be beneficial, e.g.
M – Rest
T – Short
W- Med
T – Rest
F – Short
S – Light Core/spin
S – Long
could easily be hours of discussion, but a few thoughts anyhow…