How much longer will the space station fly?

Flying 250 miles overhead, the international space station can be seen with the naked eye. Orbiting the Earth every 90 minutes, usually carrying a crew of six. Before construction of the station is even complete, there is already talk of when the lights will be turned off. NASA is waiting for the Obama administration to decide how much longer the station will fly.they are also waiting to see if they can return to the moon, or maybe a trip to Mars?