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I'd argue that one.
I get where you're coming from, that I'd you'd just done 1h all out you could have done more. But if you're fit you could get within the accuracy of a power meter in a longer ride if you've the genetics for that kind of riding.
And @amey the rp3lc is a good FTP test. Even if you're rapid and do it nearer 50min that's good enough FTP.
skinny
The other side being that you can't expect to hold you FTP for an hour in the middle of a longer ride - if you can, then it's not your FTP.