Say, there's a crime scene, and there's a lot of blood. The blood has to be tested. How long does it take to get te results?

I'm doing research for a story. Okay, it's অনুরাগী fic, but just because I don't get paid for it, doesn't mean I shouldn't put my best effort in it.

শ্রদ্ধার্ঘ্য to the first person who can give me the correct answer.