Just to prove I could do it, I constructed a hierarchy 1 million (and one) levels deep, with each directory name being 255 bytes long. Then I made sure that GNU rm could remove it. Since I didn't want to wait forever, I created it on a Linux/tmpfs file system. It took a little over 2 minutes, with a little thrashing. I vaguely recall seeing that rm's working set was around 400MB.
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