I couldn't speculate. I think it's shorter than what we had originally thought. There was a prevailing conventionalism not too long ago that time was on Taiwan's side. That is, if Taiwan could maintain its democratic course and China continued to economically modernize, this would be a positive scenario for both sides of the challenge.
Increasingly, it seems that time is not on Taiwan's side, so I can't speculate on the number of years. I think all of the analysts are considering the various types of scenarios and invasion scenarios people have talked about, the challenge of a coastal invasion in Taiwan and so forth, but it's beyond my expertise to be able to give a date except to say that, politically, it seems to me that the window is much shorter than it was before.