http://celestrak.com/events/usa-193.asp
Assuming this information is correct and using the same approach as applied to the analysis of the orbital debris of from the
Chinese ASAT test, we obtain the following chart. It shows the percent of the 169 objects which decay over time (at least 59 of which are reported to have already decayed), based on our analysis. The black line represents 10-cm objects and the blue line represents 20-cm objects. In the 10-cm case, the last object decays 67 days after the intercept; in the 20-cm case, the last object decays 113 days after the intercept.