What is your set time between breaks, and break times?

Hello all,
Searching the archives, I failed to find a thread such as these: An archive
or poll on the common between-break times and break times, preferably with
scientific backing :)
If there is already one, I apologize an kindly ask you to point me to it ^_^

I'll start:
 - My physiotherapist friend (working in a work-gymnastics company)
suggested that for "daily, intense, continuous labor at the PC, combined
with bad postures, you should break for 10 minutes after 60 minutes, with 5
minutes stretching and 5 minutes rest"
 - And in wikipedia http://en.wikipedia.org/wiki/Computer_vision_syndrome ,
they suggest the 20-20-20 rule "After 20 minutes at the PC, stop and look
at an object 20ft away, for 20 seconds"

So my set times are
 - Micro-Breaks of 20 seconds, after 20 minutes
 - Rest-Breaks of 10 minutes, after 60 minutes

Cheers!
Dario

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