I wish I had continued to run for longer.
I wish I had continued to run longer.
I wish I had continued to run more.
What is the difference between these, especially semantically?
In my view, the adverb more is cover term, isn't it?
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I don't think including for would ever affect the meaning. Since continuing to run is a relatively uncommon activity, let's look at...
I can't say I think there's anything wrong with #2 there, but it's worth noting that you can't introduce for with other "comparative adverbs". It's okay with longer, but ...
- "I ran for faster than you, so I finished first" (not valid English)
So given that for longer isn't particularly common anyway, and it doesn't involve a principle which can be extrapolated to other contexts, I'd say it's not really worth learning (except if you need to satisfy yourself that the usage isn't actually "incorrect").