MannKind is one of my favorite companies in biotech; and oh boy did I get some criticism for admitting it a few months ago. Unfortunately, Goldman Sachs downgraded the stock earlier in the year; giving investors a bad feeling about MNKD and causing declines that lasted for months. However, I kept my faith in the stock, and I'm glad I did. Today, MannKind is on a bull run, and has been for several trading sessions. Now, the big question is, "How long can the bull run last?" Personally, I think we're going to see long term gains, here's why…