So,

I've read data sheets on the fuji site that claim most of their slide films don't need reciprocity adjustment unless the exposures are over 2 minutes. On the other hand, this data sheet for fp4 here Says that an exposure as short as 8 seconds would require 25 seconds of extra time to compensate; and for a 30 second exposure, you should add 150 seconds. Does this sound about right? That's a pretty drastic difference that i wasn't aware of.