How long does it take for a spider bite to kill you?

Actually just recently the funnel web was recorded as the worlds deadliest spider.

Depends. Funnel Web Spiders found in Australia can be VERY venomous but the ones found in the U.S. are relatively harmless.

The first statement is false, as the Funnel-Web spider has long and is still considered to be inferior to the Brazilian Wandering spider. A Funnel-Web spider commonly can kill a human in between 40 minutes and 1 hour and 40 minutes, never less than 30 (this can vary depending on the victim's immune system level). While the Brazilian Wandering spider has been known to kill humans in 20 minutes.

Funnel webs attacks can sometimes be very rare, In Australia the states that funnel webs are in are : ACT & NSW. Some doctors and nurses are still trying to find out how to cure it.