the data is for "average American with a full-time job". This assumes that they have already completed their education. 6 min/day is about 36.5 hours of education, which seems quite a bit for a professional
6 minutes a day is impressive for a professional assuming it is not related to work.
Also, for some professionals, working at their job provides education for performing their job better. They should have split working and commuting from each other, or at least provided a split of the data.
You don't complete your education, just because you have a full time job. You should never stop learning new things (or revising your opinion/knowledge of things you were taught earlier).
