I want to make two comments - firstly there is something very wrong with the business world when you have to avoid the 9-5 full of interruptions to get any work done. I know this from experience.
Secondly compare this to the Peter Higgs (of Bosun fame) saying he would never have got an academic post today because he would not be seen as productive enough - in other words he did not get up at 4 to do a days work before going and doing a days interruptions.
We are getting something terribly terribly wrong with our working days.