using an android phone, my phone has maximum screen timeout of 2 minutes.

I use the gallery to draw and sketch things, and etc for my work,
and I have keep turn the screen on every 2 minutes.

Would anyone prefer a gallery app which could be set to have unlimited, or at least has a long time screen timeout?

or what could i do to change the setting on my phone?

edit) just heard that a normal HTC Sensation would have timeout settings of:
 15 Seconds, 30 Seconds, 1 minute, 2 minutes, 10 minutes or Never turn off.
I am missing 10minutes or Never turn off.. what could i do? :(