It’s a general question I ask of everyone who claims they are 10x more productive. Year/month/day/hour doesn’t matter. Did you do 10 days of work yesterday? 10 weeks of work last week?

It is actually a very forgiving metric over a year because it is measuring only your own productivity relative to your personal trend. That includes vacation time and sick time, so the year smooths over all the variation.

Maybe he did do 5 weeks of work in 1 week, and I’ll accept that (a much more modest claim than the usual 10-100x claimed multiplier).