The only relevant experience I have here is one of my godchildren who commuted about 45 minutes on a bus until sixth form; then switched to a local school within walking distance. DGC felt that this was a revolution, was very much happier and said life was so much better, even though the school itself was less satisfactory really. So that is the opinion of one child. My son does a 20 minute bus journey which seems fine; personally I reckon more than 30 minutes each way on public transport might be verging on difficult or unpleasant and rather tiring, but I know many do more than that and will say it's fine. Over an hour would definitely not even be considered in this house- I am sure no matter how wonderful the school is deemed to be, nowhere could be worth that. But I know this arouses strong emotions and some parents think this quite acceptable.