'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
Yes, by default the sharing is for one year. However, via a request message to Tony Sir, you may receive an extension. This extension could range from one year to three years. Exceptional contributors who are very consistent in their contributions without long gaps may get an extension of more than three years.
A good way to get an automatic extension for articles' revenue share is to republish old articles. However, you absolutely should not republish article just for the sake of getting the extension. You must first check whether it is getting any traffic. During tuning of old articles, those which do not get traffic & thus are not fetching revenue will get shifted to the archives so there won't be any question of you getting a revenue share from those.
Note that contributions in other sections are also checked out when the Webmaster decides on whether or not to grant an extension & for how many years. It also depends on quality & consistency as well as adherence to rules. A member who has been constantly posting copied contents or violates other rules of the site will not get any extension.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)