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How long is an opening?

It would be nice to hear your conclusions. You presented data, but offered no interpretation. For example, you could say "based on this data I interpret the opening as ending on move X" or "based on elo the number of opening moves does (or does) not become affected".
Cool stuff. You could show a scatter plot of Elo vs opening depth and see if we see a clear trend, or can fit a linear function for example.
Conclusions?? I came here to find 'How long is an opening?'. Still no answer :)
Your blog post was very good, but you didn't explain about the conclusion of what happened to the opening depending on the elo.