From my brief experience, once it is done it parks the extruder head at the
top and the build plate moves to the bottom and the system seems to turn
off the heat automatically (because when I try another print it has to heat
up again).  I would say don't leave it unattended until you are sure it is
printing properly and even then I would check in on it from time to time.
 I don't think you want my experience.  I haven't heard back from Makerbot
support on the gummed up extruder so I guess I will start playing with
heating up the extruder and trying approaches to degumming it.  I also
suspect I don't have a perfectly level build plate based on my problems
levelling - which would also account for the gummed up extruder.  I will
try a straight edge on the build plate to verify that.