[yodsanklai]

My most productive days were when I was a math undergraduate. I would work pretty much all the time for weeks. This was before internet invaded our lives. I was also very productive the last few weeks before I had to submit my PhD thesis. No particular technique, just the stress of deadlines or studying in a competitive environnement.

Occasionally, I work non-stop for a few days on some programming projects, but I wouldn't consider myself productive. I get very excited and obsessed by the coding but I'm not very efficient, in the sense I tend to code more than I think and it's counter productive.