Can you use EXPORT MARKS even if the car should stay in GERMANY????

So I would have a question: can the export identification mark be used for 30 days or like a 5day registration plate without having to use the car abroad after the end of the time. I had once heard the export identification mark to serve as a transfer to foreign countries. I actually only need a SHORT TIME mark but with a PERIOD of more than 5TAGEN. Who can help me there? And there are other registration plates? And what costs me such an export identification plate and I get the al He’s a private person. I’m very happy about every answer.