I am not aware of any such limitation.
I just tried it by placing a Source Worksheet Marker which created its new Worksheet Viewpoint, then I kept multiplying them until I had 1200 Worksheet Viewpoints. Then I stopped.
But at this point I think your file with 1200 Worksheets full of content would become huge, possibly in the gigabytes range.
So if you have so many Details you may want to consider splitting them up and grouping them into several files so no such file is more than a few hundred megabytes.
With trial and error you will see what it the file size or number of Worksheets where it starts be become harder to manage. That will probably be a good point to start a new Details file.
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