Guess what! I found a factory error on Bronx BUS MaP April 2012. It says the bX 27 operates every 4 minutes during sunday late nights. Think this is the current map so check out the mta website.
On sunday at 3pm the S74 took me nonstop from Target™ until ND lane. It arrived 7minutes early. I wonder how it is at nite. Also, the bus is overairconditioned. Specially if you came all wet from massive rain. Its been raining very heavily lately.