@knusperkeks

For a 40 bit wep key, in as little as 10 minutes. With 104 bit, it can take longer. It all depends on the amount of IV (initialisation vectors) you can generate. Doing an arp replay, and then artificially generating arps on the target network will get things going.

In a business network, there is usually enough arp chatter naturally that this isn't necessary, so you can prove your point pretty quickly.