Hi,
I was wondering, for those of you who have had your interviews already, how long did yours last?
Mine lasted over an hour and I was curious to hear how long others talked for.
Mine was about 50 minutes 
I think it’s a normal amount of time.
I didn’t have my Dartmouth interview yet (it’s next week), but my other two college interviews lasted around an hour and 15 minutes. The length of the interview is not indicative of quality, and quality is definitely not indicative of acceptance/rejection . My friend (who was HS class of 2014) had an amazing Dartmouth interview last year that lasted SIX HOURS but was outright rejected, not even waitlisted.
My daughter’s lasted about 45-50 minutes.
There are things to wonder about. This isn’t one of them.
Unless your interview was 15 min or shorter and the interview walked away grumbling in disgusted tones about you (kidding of course), comparing lengths will mean nothing. Really.