I sign out roughly twice a year

Why do you opt out twice a year, once you opt out thats it, un less you move company or opt back in.
Also if you opt out, doesn't mean they can make you work more hours. Its also an average, so you can work more than 48hrs in one week and not opt out.
I always opt out, as if you want to work more it allows you, if you don't, the company still cant force you.