Could you do an update,run the game and wait a bit.
You do not have to replay any levels, but this will allow times to be synced with the new Leaderboards.
It will also allow you to easily see how well you have done compared to others.
The new Leaderboard gives an overall best game time.
I have currently called it 'Best Accumulated Level Times' but if you can think of a better name please let me know.
Happy Gaming
Steve