How long did it take you to find your first duplex?

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I'm starting to look for duplexes with a realtor. We've been looking for about 4 weeks now. So far I've looked at 6 properties most of them were in bad condition or in bad neighborhoods. Out of 6 properties I looked at we made 1 offer which didn't get accepted. The market looks pretty dead right now. There aren't any duplexes available. I'm in the Dallas Fort Worth Area. Is this typically how the process is?  

I read somewhere that the best deal never get posted, it's mostly insider investing. Is that true? 

Any advice would be appreciated. Thank you