On a recent rash of waterfall projects the SADs were in the 80-150 page range. However, I suspect that each contained only 10-20 pages of insight.
These documents were read fairly thoroughly by the offshore team, though! Perhaps in the absence of someone to talk to about the architecture or requirements the documentation acts as a surrogate (albeit a substandard one IMHO).
Very few people onshore bothered to read the SAD - they relied on the information being presented to them instead. In terms of reviewing the architecture, the latter seemed to work best!
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