If it had been water and the xbox was switched off quickly I'd say leave it for seven days before trying to switching it on. Give it a natural time to dry off completely, with any help like a hairdryer etc. Stella on the otherhand, seems to be quite sugar intensive compared to water. Glutenous stuff and electronics seem a no no.
Still I'd wait a while for the liquid to completely disappear and hope for the best and expecting the worst. Good luck..:)