I assumed you are talking about how long the classifeds are displayed on EasyExpat.com?
They are displayed for 3 months and will be automatically removed afterwards. It avoids people forgetting about their ad and getting a response to rent their flat 2 years later
And yes, after that, if you still want to advertise the same item, you have to post a new ad.

 

It's free and will be displayed as long as it respects the rules, no spams, no scams, no fraud, no duplicate with multiple same posting, no company posting in sections where it warns individual ads only...etc.