Digital BW, The Print

Sorry for the way off topic, but can't find any info on this..
I've got an old Nikon F2 that only goes up to 2 second exposures but 
heard that it's possible to meter for up to 10-15 second exposures.  
Does anyone know how to do this?  I've got a night shoot coming up 
and this could really come in handy.  
I don't have a light meter, but could get one if necessary.

Thanks for the help!
  -Daniel Perez