Whats the max range in real life

My question, what's the max range of an AirPort Extreme REALLY - I don't mean in a lab or on paper. But in real life w/ walls and such... Would like to know for G/N networks. I'm just looking at buying 2 Airport Extremes and having one "extend" the connection the network, so I'd like to know how far could I place the two apart while maintaining a reasonable speed.
Also, how much would the connection be effected by metal walls (ie commercial walk-in refrigerators)

LaFramboise:
I've spent some weeks trying to figure out your question for a real-life answer. It just not helps to now that in "LAB" conditions you´ll get a 100-mile range when you discover that in "real life" a simple tree + a wall will kill it.
I just moved to a new apartment 2 blocks from my office and I happen to have line of sight to my office window from my apartment, except for a robust tree that initially played some weird jokes on my reception.
Using 2 Airpor Xtreme stations, I managed to establish a very decent wireless network, allowing my house to use my office internet access (which I also pay, son why pay double ISP).
The distance between these two Xtremes is AT LEAST 328 feet (100 meters) and no more that 492 feet (150 meters). It's a 2 block distance. I pass a tree almost right in front of my apartment window, so I really dont have a cristal clear view on both airports. This sounds really great...
INSIDE my apartment, distribution of space is kinda weird: a shoe-box apartment with a center corridor all along the house. Thing is that funny, I have One Aiport Xtreme (as main receiver for the internet access) and I have 1 Aiport express in the same room of the Xtreme for music sharing, another Airport in the room next door (studio) also for music sharing. Problem is that due to my apartmen config I can't get a third airport express to connect from the living room which is in the other side of the apartment. I tell you my sad story because it is extremely hard to determine range. I have a two block connection on one side, and because of walls, etc, I cant hook to the other end of my apartment wirelessly. I already started to consider a ethernet cable to connect them. Can you imagine the CAT5 running all across my apartment?.

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