Nutmeg is quite sedating. Very "stony" high, similar to strong indica. Mental cloudiness, relaxation, etc. It makes your breath smell like nutmeg too!
I generally eat between two and four whole nuts-meg, takes perhaps 3-4 hours to peak and lasts for a good couple hours. I suspect if you loaded up on shitloads of 'meg it'd last a day.
Admittedly, I don't pay close attention to the high; I spend more time enjoying it than documenting it.