It is a Long-Term Commitment
While NASA admits that it is unlikely that early astronauts can even come back to Earth, they do hope that the mission will be limited to three years. During that time, the team will perform a series of tests, including determining if the soil can support crops.
On Schedule
While there is still a lot of work to be done, you should be happy to know that NASA says that they are on schedule to make the 2033 deadline. Alyssa will be 32 by then, and you can bet that she plans to do everything possible to make sure she is on that rocket. The first trip is likely to be just a scientific team, and it is unlikely that they will ever be able to return to Earth.