This is about Marathon training, but outlines the principle I think?
You want to arrive at the starting line well trained, not overtrained.
https://www.trainingpeaks.com/blog/should-i-run-long-runs-at-race-pace/
I'm definitely guilty of getting carried away on my weekly long runs in the past and making the next week very difficult/sore, so this resonates.
@yoshy started
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This is about Marathon training, but outlines the principle I think?
https://www.trainingpeaks.com/blog/should-i-run-long-runs-at-race-pace/