For coding I find that 45m work with 15m breaks (and a 30m long break) work better as you have enough time to get into a problem, and just enough of a break after to send some emails &#x2F; browse HN, etc.<p>The overall work ratio is lower (75% vs ~83%) 
but it&#x27;s hard to put an qualitative efficiency metric when programming anyway so I&#x27;m not so worried.<p>This ratio also worked super well when writing my dissertation - the 5m break never felt like enough of a reward after.<p>(there is also a great Pomodoro extension for Gnome if you&#x27;re running Linux).