Writing 50,000 words in a month is a stupid thing to do. It's obviously ridiculous - and anyway, how good could those words be, all rushed and full or mistakes?
The whole thing's best avoided. It's not writing, it's point scoring.
Except – of course – that it's not. It's magical. NaNoWriMo is one of those experiences, like running a marathon or skydiving (or having a child, maybe) that you can talk about all you wish, but you're not really qualified - you don't really know - until you've done it.
My own NaNoWriMo journey began back in 2010. I was living in Japan, and dating a girl who lived two hours away. We met up when we could, both travelling an hour to a convenient location in between our respective cities. That location happened to be Tokyo - a city with an endless supply of things to do, but a limited number of them for free.
'Why don't we write together?' she asked, before pointing out that November was coming, and with it, NaNoWriMo. I'd never heard of such a …