[chirp_users] UV 5R Tone Squelch

I'm using a few UV 5 R's on a commercial UHF repeater. The frequency is a bit congested. Here's the problem - The UV 5R seems to hold the squelch open for about 2 seconds after the repeater (and thus the tone) drops. Is there a timer that anyone has found that determines the time that the squelch is held open after the tone drops? This is most annoying to hear snippets of other companies transmissions - especially one digital repeater.

Thanks for any input.