[Martijn]

@robweber

I agree that running it every xx hours should suffice.
That aside could something like this work cross platform?:

PHP Code:

try:
                    date = os.path.getmtime( base_path )
                    print date
                except:
                    date = 0
                # we only refresh if it's been more than a day, 24hr * 60min * 60sec
                refresh = ( ( time.time() - ( 24 * 60 * 60 ) ) >= date ) 


Found it in a script somewhere