I think ten minuts is the limit. You just got to touch your screen every 10 minutes.

 

I got widgetsoid and used it to set up a toggle so that I can have the screen on all the time if need to. You could always look for similar app.

 

mostly maps app never turn off display when running, like my iGO, Sygic, CoPilot etc..

 

I have google maps, but cannot run google navigation in my country. Google navigation likely prevents screen from going off, but google map doesn't. One of the reason why the toggle for maintaining screen on is useful.

 

Uh uh i go the answer. Go to android market seach for SCREEN TIMEO
TIMEOUT. A huge list of widgets will show up. Pick one that fits you. I chose one called scren off. You turn it on and off is like a lght switch on your screen.