I looked online for some info on how a long commute might affect a child's education and decided to rule out any journey longer than 1 hour and any journey involving a connection of transport. I find it stressful when a connecting train / bus doesn't show up and I'm late so I wouldn't want to put my 11 year old in that position.
If you click on this link / google the EPPI study then google the references that the EPPI study cites you'll see some evidence that long journey times aren't ideal:http://www.scotland.gov.uk/Publications ... 14690/4177
"Long journeys to school have a negative effect on children's educational performance. Long travel times in an uncomfortable bus or an inability to participate in extra curricular activities reduce academic achievement (EPPI 2001)"