You normally don't need more than 300000 ivs to find a wep key in general. Regardless of how often the wireless network is used, an injection attack will make the process much faster.

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You aren't just capturing every packet your card picks up on. You need initialization vectors. Even with a heavily used wireless network, gathering a workable amount of ivs can take hours. With aireplay you can just forge arp requests and the router spews packets with ivs.

In fact, I don't believe any program for windows can do an injection attack, aside from cain, which requires a airpcap adapter.