How many AirPort Express stations can be supported by an AirPort Extreme wirelessly?

I got one AirPort Extreme in my home and would like to extend the wireless network by purchasing additional AirPort Express.  Wanna know how many AirPort Express stations can be supported by an AirPort Extreme wirelessly?
Thanks.
Tony

Bob -- question for you which I can't answer as I don't have an airport extreme. The newer Extremes can create both G and N networks and can create the N network in the 5 mhz band. Can you increase the number of Express units you can connect wirelessly if you split the load between the 2.4 mhz G and 5 mhz N networks created by the Extreme. (recognizing that the 5 mhz band has less range than the 2.4 mhz band)
Not an issue for me as I only have three connected wirelessly, but I've always wondered about this. Of my three AX units one connects to a G network created by a Linksys WRT54GS and two connect to the N network created by the AX.
So instead of 3-4 AX units could it become 6-8?
Carlos

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