I was inspired to find out after being pointed to this image of some hundreds of Apple Mail windows in Expose.
The image below was done on a PowerMac Quad G5 with 4 GB of RAM. There are about 1000 windows (600+ email messages, roughly 300 Finder windows, 4 iChat windows, 1 Safari and 1 iCal). I originally tried to open 1079 mail messages, but Mail crashed. Perhaps a 1024 limit in Mac Mail?
Expose took about five minutes to render, but the return to the Desktop was almost instantaneous. Expose is apparently not cached, because going back to it without touching windows caused another long redraw.
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