Looks like that data only looked at 244,346 commuters inside 495. This article says there are 160,000 "super commuters" in greater Boston in 2019, and notes that number is probably much higher in 2022 due to a 19% increase in urban to suburban/rural moves nationwide.

The Globe article doesn't say how they defined a "super commuter," but the US Census Bureau defines it as a 90-minute one-way commute. Or 180 minutes both ways. Which equals 3 hours. Not quite 4 hours but way more than 45 minutes.

As someone who spent his entire life just outside 495, I can tell you anecdotally 2-hour one-way commutes are the norm.