Does adding 2 miles in the evening do anything or waste of time?

You're right, he needs to keep it at 30 now so that Wetmore will think he has Untapped Potential.

30 mpw*

Do the 2M. I run 2M per day and it does make me feel fit to an extent. Adding it as a double will definitely help. Maybe do 3M 2-3 X per week. Either way, the 2M helps. I used to run 100+ MPW, and now run 10+ miles per week and it helps a lot. Also, consider a weight program. GLTY!

Your 2nd easy run isn't intending to elicit an aerobic response!

Adding as a double will be easier than adding it to the one run. Go for it!

Totally worthless doing a 2 mile run if you run anything faster than a 20 minute 5k. Try to consolidate those miles into longer runs. Seems like you have the ambition.

not even debatable. 100% waste of time. it will take you longer to change clothes, take a crap and stretch, then the actually running. time better spent doing core or something.

Do it. I always tell my runners ‘every run has a purpose’

In your case, the purpose might be to slowly add mileage. For others, a 2 mile easy pm run might be to loosen up muscles from a hard workout earlier in the day, or a shake out run for the next morning’s hard effort.

Good luck and find what works best for you, your ability, your schedule and your goals.

Just wondering, what's the minimum time or mileage that adds to aerobic development??

I know every runner is different but say someone who's not really serious about running, running a 5km in 20-21mins.. what's the minimum time on a run to get an aerobic increase?? Thanks.

I think 8+2 could be more beneficial than 10, depending on the runner. The biggest drawback would be the time constraints, having to lace up, run, shower twice, etc. much less time to add those 2 miles into your first run.
To focus on aerobic development is the wrong mentality. I personally saw a large development when I began to double, even just 2 miles a day, and it wasn’t strictly aerobic. When you start running that frequently, your body just becomes more efficient and used to running, and that could be felt even at very slow jogging paces. I think it’s worth trying out and see how it works for you. You would need to do it for at least 3 months before really noticing a difference.
If I was going to try to get as fast as I could right now, say for a 10k, and time/outside responsibilities didn’t matter, I would definitely opt for the double. In addition to all the other benefits, I loved the freedom it gave me with regards to pace and distance on any particular run. If you are running 2x as much, you can decide to go slower or shorter on any particular run without it feeling like a disappointment