That will be the first crewed flight of the Artemis rocket. The first one tested the technical aspects of flying around the moon. This one will have humans in the rocket and will test the procedures that go with the flight.
I would probably not be lying if I said they will fly for about 10 or 11 days around the moon. During that time, they'll evaluate a large number of systems that maintain the life on the rocket, but also technical things related to the flight itself.