For diagnosis of lunacy, a person can be kept under observation at a stretch for -
2 Days
7 Days
10 Days
30 Days
According to Mental Health Act, 1987, if giving opinion on the mental status of allegedly mentally ill is not possible, the magistrate may permit observation of such a person under section 28 in an observation ward of a general hospital or another suitable place for 10 days at a time, extendable to a maximum of 30 days.