According to Finn Lewis's estimate, they could complete the game in a month. During this month, they wouldn't need to leave the nutrition capsule, which contained enough nutrient solution to provide the energy needed by a person for over a month. The capsule also came with muscle-stimulation and restoration measures to prevent muscle atrophy.
Moreover, based on their current physical condition and the calculated exertion in the virtual war game, their muscle strength would sync with that in the game, including resistance to impacts and so forth. After they left the capsules, they wouldn't feel a disconnect between their physical bodies and their response level.
There wouldn't be any adaptation issues - this was the strength of the nutrition capsule. It wasn't something Finn Lewis bought directly from the Galactic Federation; it had been modified by Zero and Luna Starfield. The Galactic Federation's capsules were just for ordinary people's entertainment and gaming needs.
