Is there a limit to the number of airport extremes and airport expresses one should have in a network?

Is there a practical limit to the number of airport extreme base stations and airport express units one should have in a home network?

Then, I had an older Airport extreme that I was thinking about connecting wirelessly in my living room and connecting the DirectV DVR to it by ethernet cable.
Is this older AirPort Extreme the "round" version or the "square" shaped version? The "round" version will not do what you want.
Whenever you extend an AirPort using wireless only, you will experience a loss of bandwidth (speed) on the entire network. That loss might be anywhere from 15-50% depending on how far the extending AirPort device is located from the "main" AirPort.
Even with an excellent signal, if you have 3 AirPorts extending the signal, you will lose 40-50% of the bandwidth on the network. The other AirPorts that are being used just for music are also slowing things down.
He thought there might be problems with using that third airport with the DVR and wondered if I should just use an Airport express there.
It would make no difference whether you used an AirPort Extreme....assuming it was the "square" version or a new AirPort Express as far as performance is concerned.
As to whether you connect the DVR to another AirPort, it might be OK, but you will not know until you try. 
If you find that things slow down noticeably, you will need to look for ways to connect the AirPorts together using a wired Ethernet connection. This is always the preferred connection method since there is no bandwidth loss when you do this.
Since downloading video places a high demand on a wireless network, you might want to look for a way to connect the DVR back to your "main" router directly using a wired Ethernet connection as well.

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