I was curious as to how much bandwidth Netflix uses when watching a movie. I decided to monitor this by watching Warrior starring Tom Hardy and Joel Edgerton. Runtime was 2:19 hrs. My 21CN broadband connections sync rate is ~6Mbps. Using my PS3 plugged directly into a Sonicwall TZ 210 I SNMP monitored the port (X6 in this case) in Cacti.
X6 – LAN interface
X1 – WAN interface
Total: 4GB in size – peaking at a steady download rate of around 4-5Mbps