The website says "most" are processed within 5 business days. However, I think it was one of the student websites (British Council?) that advised to give yourself plenty of time in the summer, as that is when consulates get swamped with student visas (and mine's about to join the fray!).
As someone who is currently striving towards becoming a visa monkey for the US (Foreign Service!), I can sympathise. Can't be easy, in this heat (like they don't have AC, ha), processing 1000s of visas for people who just want to get into your country!
