Entire game is roughly 20gb so it depends on your download speed, files are compressed so it will be less but how much less not sure.
Just wanted to mention that this patcher is the most ridiculously broken launcher I have ever seen.
So now the game is redownloading itself. We will see if I have the patience, or if I just drop the sub. Its pretty hard to wrap my head around this kind of serious bug - the client is not small - being around for years.
Fix the damn launcher, there is no excuse. Totally broken.