Of course one way to justify lengthy story research is to use my findings in more than one story. In researching Seppuku (a comic book that has been accepted by a publisher but is still awaiting an artist to draw the damn thing) I did some reading on Zen and came across a phenomenon called makyo that sometimes occurs during meditation. When shortly afterwards I wrote my novella The Mask Behind the Face which also featured meditation I again made mention of makyo. Two bits of research for the price of one!
However I didn't merely repeat the same bit of information. In Seppuku I emphasised the meditator's sense of bodily distortion whereas in Mask I emphasised the possibility of them encountering "deities" during their meditation.
I don't often get that kind of carry-over with my research but it's nice when it does happen.