If breaks are too long, then I would advise you to either of these two:

1) Have shorter Pomodoro length. The length of the Pomodoro and the break is loosely coupled. The longer Pomodoro you have the longer the breaks will be. Subconscious forces will do that.
2) Simplify your break activities. Don’t read articles—that’s an activity that should be scheduled in a Pomodoro.

Pomodoro Technique is adaptive. Every day ends with a retrospective. If you find out that 25 minutes is to short—perhaps you have to spend a significant amount of the Pomodoro on setup—then try something longer. Be consistent with the length for at least two weeks though. Otherwise your tracking won’t be comparable. I.e. you can’t compare the number of completed 25 minute Pomodoro with the number of completed 48 minute Pomodoro.

Would I break the Pomodoro process if I decide to go for 48 minutes work increment + 12 minutes of pause, instead of increment of 25 minutes + 5 minutes of paus

Best Regards from France
Tare

Great description, and technique, So far I have been more productive today than any day the previous week.

I still have one problem though, the small breaks keep ending up being 15 minutes, because I get up talk with somebody, read an article. What kind of advises do you have about that.

To start the watch to keep the breaks short also seems a bit hash.