It's not true. I'd say at max he smokes ten and even that is over the top. If you want to be baked all day then you only need two to four blunts - depending on the size of course.
2-4 don't really cut it (I'm talking non pure joints, not sure what blunt exactly refers to as I'm not a native speaker). The few times I went wake n bake it took more than that. Considering how much he smokes, I'm assuming he grew some tolerance and probably needs more.
But yeah, that's excessive.
You don't really grow any tolerance to weed. You just gain the ability to handle it better making it appear to have less of an effect even though it is.
But yeah, that's excessive.