The power options are stored in the "Kobo eReader.conf" file. At the moment mine has:
Code:
[PowerOptions]
AutoFrontLightOffMinutes=15
AutoSleepMinutes=15
The number is minutes. I don't have mine set to automatically turn off. The option for that is "AutoOffMinutes".
A "quick" test shows that if I change the values to 1 or 2, the time-out happens at about those times. As 60 is the maximum that can be selected, I am pretty sure that any values up to 60 will work. Above 60, I don't know, but it won't harm to try it. Several of the other options do work with values outside the selectable range.