Mi carpeta pesa 18.4 Gb, + los parches que se descargarán el dia que tengan "Early Access" es un aprox de 19 GB.

Según lo que he averiguado es:
18.4 USA
18.5 Europe

"If you participated in our Game Testing Program before November 25th, we recommend that you uninstall the game testing client (refer to instructions below) and then download and install the launch game client. We’ll update this post with more instructions when they’re available. You will need 27GB of free space to install the launch game client. The actual size of the game client is approximately 19GB (without additional languages installed). "

Fuente: http://www.swtor.com/community/showthread.php?t=714124