Running 100 miles with no speedwork, whats the most likely outcome?

There is only one way to answer this kind of question. Anything you get here is a guess.

About 2:50, assuming you recovered well from your injury.

You will lose all your knee drive and your testosterone will plummet. Random people driving by will slow down, roll down their windows, and taunt you for looking like a stereotypical hobbyjogger.

I’ve done it. Went from around 40-50 mpw and 2 wkouts ran 1:08 half. The. 100 mpw no speed and ran 1:13

I’ve also done it, no speed work and consistent 100-110 and ran 48:24 for 10 mi at age 22.

At 120 mpw you will start cutting your shoes in half

Oh yee... 😆👏👏👏

Nenow training:

Whitlock training:

I humbly submit that there is no FM, only M and HM.

Sub 2:30 'thon in your sights!

You’ll end up being out there hating life everyday after a couple of months when your excitement out of curiosity wears off.

You can read the old Joe Henderson books for some case studies. Guys like Amby Burfoot were running pretty decent mileage with no speedwork, but racing pretty frequently. Burfoot had a Boston win (in an Olympic year when some would-be contenders skipped it in favor of the trials) and a 2:14 at Fukuoko. He was best of the people profiled in that book.

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Quite a big jump, would probably get injured going from 80 miles to 120.

Anyway, let's just say 2:35-2:40 range. Eventually the pace becomes an issue and that will start around 6 flat pace. If you're running easy pace like 7 minute miles all day every day you're not going to be smooth at sub 6 if you never train at the faster paces.

Amby Burfoot. Ed Whitlock. Huge miles with no 'speed work' and only races. They are the exceptions that prove the rule. They don't do "speed work." But they race. Do you see it now?

Just because you don't hammer 20 x 400m every other day 'til you puke, doesn't mean you're not doing speed work.

"I run easy pace every day. No speed work."

Same pace very day, but their HR data is through the roof. Makes me sweat just looking at it.

"Easy pace!" Yeah. Right

This along with some strides (100-200m flat and uphill 2x week) and a tempo or two a week can get you to sub 2:18