Yes I am sure, if you manually type in 10 minutes for example, it defaults to the highest amount (265 minutes or something equally as high)
I find that because I move between two offices that are near each other and with different WIFIs I need the time to be lower so I dont have to wait too long before the app switches wifi back on again - 15 minutes is too long.
PS - sorry i dont mean to bother you on your holidays, this can wait!!