Changed the console blank timeout

The screen blanks after a predefined timeout (during installation).
This change sets that timeout to 60 minutes, buy which time the
installation should hopefully be finished.
you can also add a simple

    echo -en '\033[9;3]'

into rcS and even time how long it takes for the monitor/TV to turn off (3 minutes in this case)
also, delaying rcS is simple, just add

    sleep <num_of_seconds>

and maybe some echos, so you know what's happening :wink: 

and yes, I've noticed that too, most of the time my screen would blank during installation, but not every time... maybe some key was pressed (and I forgot about it), not sure... the blanking bothered me enough to add this, though :angry: