Weather is just right for a mug of hot chocolate

It is getting cooler by the day here and a mug of hot chocolate is what I would want to have. 

But what you see in the photo is not the size I would opt for. Talking about size when I was on that package tour of the US everything that they served was huge be it tea, coke, ice cream and even pizza  Half of it would go to waste. 

No doubt that tankard of hot chocolate looks quite inviting but I am  not sure if that is the standard size.