That was definitely the fastest I have seen a Tropical Storm fall apart. It had not even made it inland before all of the strong convection collapsed. It all happened within a 2 to 2.5 hour period.
Tropical Storm Hermine last year lasted a LOT longer than Don. (Granted Hermine was a strong Tropical Storm.)
-------------------- 2011 Season Forecast: 16/09/04
2011 Systems: 10/01/01