Zelenskyy says Ukraine plans to indefinitely hold Russian territory it has seized

For how long will Ukraine manage to do that?

Resolves Yes once a respective date is reached and some part (at least 100 km^2) of Kursk region is still under Ukrainian control. In case of Russia fully taking the region back (i.e. Ukraine controls less than 100 km^2), all dates that haven’t been achieved yet will immediately be resolved No.

100 square kilometres roughly equals to 40 square miles.