For Time or Distance?

I've been doing some reading lately.  About running.  Specifically marathon training.  And I've seen lots of people saying the same thing.  At first I pretty well dismissed it, but I just KEEP seeing it, so it's pretty hard to just ignore.  And the people saying it?  Yeah, they're no idiots.  So now I'm a little perplexed.  What is it I'm talking about?  This.

"There is no physical or aerobic benefit to running beyond three hours."

I didn't bookmark anything to link back to, and I'm not going to cite anyone in particular, but this seems to be a VERY popular opinion.  If three hours gets you 22 miles, great.  If three hours gets you 15 miles, so be it.

If I continue doing my long runs the way I have been--running comfortably and walking every mile--3 hours would get me to about 16 miles.  That just seems BONKERS to me, to go into race day only having run 16 miles!  I know the Hanson Brothers plan only goes up to 16, and lots of people go on to run a successful marathon with that plan.  But I just don't think I could do it.  The thought scares the crap out of me.  Would I love to ditch my 18- and 20-mile training runs?  HELL YEAH I WOULD!  But I'm just not sure I could get to the starting line feeling prepared if I did.

So what's your opinion?  How long should your longest training run be?  Have you ever gone into a marathon on less-than-optimal training?  Do you follow the three-hour rule, or do you do the commonly accepted 20 or even 22 miles?

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