you might want to check when "off peak" is. It's not like other off peak. I think my mum's ISP off peak is midnight to 6am - not usual awake times.
Some ISPs provide access to the ABC stuff "unmetered" ie you can watch as much as you like and it doesn't count towards your monthly download quota. Most ISPs provide a way to see how much you have downloaded so far - so you can see if you're using it up too quick. So you could have a movie / tv / youtube splurge at the end of your billing period.