Hi
Click on the clock, you can see that :
Era duration:
Realm’s eras in Imperia Online aren’t everlasting.
The current era of your realm started on 04.09.2015
The maximum duration of the era is 8 months.
The era may end before expected, when after the "Lords of the realm" competition has been activated (approximately 20 weeks after the beginning of the era) an alliance manages to maintain at least 60% influence range for minimum 84 hours.
End of era ~ february