Firstly, congratulations and speaking as someone who joined this world saw how long it took to upgrade anything and left almost straight away am a little bit in awe you made it to the end!
You should/will see a timer appear (you'll get a report probably when the game updates overnight) which will start the 10 day countdown.
Now seen that you are wondering why you have the countdown when no one around to fight you and is because when the countdown ends you will lose access to the tribe forums and the accs so take the time to clean your villas and move your possessions out (premium, any threads you wish to keep) and take the time to say your goodbyes as once the world shuts that will be it!
Anyway good job, well done and shout if you have any more queries (timer doesn't appear etc etc)
Bows