• A programmer takes between 10-15 minutes to start editing code after resuming work from an interruption.
• When interrupted during an edit of a method, only 10% of times did a programmer resume work in less than a minute.
• A programmer is likely to get just one uninterrupted 2-hour session in a day

We also looked at some of the ways programmers coped with interruption:

• Most sessions programmers navigated to several locations to rebuild context before resuming an edit.
• Programmers insert intentional compile errors to force a “roadblock” reminder.
• A source diff is seen as a last resort way to recover state but can be cumbersome to review

Read full article at
http://blog.ninlabs.com/2013/01/programmer-interrupted/