In which case 50 minutes a week becomes 10 minutes a day which doesn't strike me as unreasonable - a bit of prayer, bible reading, maybe a weekly group of some sort and you could see how they got to that number.
Plus I suspect this is one of the things people will over estimate (in the same way that they'll probably underestimate watching TV).
If these numbers were the result of dividing by 7, that would put the working/commuting number at 64 hours a week instead of 46.
40 minutes of non-weekend volunteering/religious activity sounds perfectly reasonable to me. I haven't seen the church part as much on the coast, but back in Texas there were a lot of people I knew who went to at least an hour's worth of in-week religious service.
I agree, with your observations, in California people might work 50 hrs a week and commute 15 hrs (90 minutes each way)
Which is why it would be interesting to compare Texas vs Arkansas vs California vs Montana vs college degree vs no degree vs rich vs poor etc etc.
Would be interesting to do the multi-variable analysis across different factors like education, location, etc.