Can re-enter with visa straight after 15 days visa free?

Sorry for yet another boring visa question. Can my guest go to Cambodia, get a visa and re-enter without waiting 15-30 days if he likes it here? after he has exhausted his 15 days visa-exempt time? I cant really see why not as first he was visa-exempt then he had a visa but it would be terrible if they didnt let him back in or told him to wait a month in Cambodia by himself.

New topic