Luckily, NASA seems to keep the crew busy. Once they reach their destination, they will simulate virtual spacewalk missions to inspect and collect samples from the asteroid. And they'll apparently have to respond to a few emergency scenario simulations, including navigating a debris field during the return transit phase of the mission. Plus, they're not entirely alone on HERA. They also have the company of plants and brine shrimp, which they're taking care of and studying.