The Implications of Cage's 4' 33"
Question: Has anyone ever done a full concert of pieces composed by indicating arbitrary lengths of time? 5' 15"; 49' 42" and so on. Probably not. Because the main implication of the piece was in the idea of it. Any spinoff would be deemed mere copycatting, despite the differing lengths.
What's interesting is that there are infinite possibilities for such compositions. After all zero and infinity are two names for the same thing.