How long should I give a Property Management company?

[Travis Mullen]

Hi All, I'm a new landlord with a duplex in Montgomery, AL.  It closed in the last few days of September. Now we're 2 months in, and the 2nd side is still not rented.  I was told market rent was going to be about $650-675.  We've had it down to $625 for the past month and hardly any qualified applicants according to the PM.  A fellow BP friend told me to post in on Facebook Marketplace, and I probably have received about 150 inquiries, and I would send them the info and the link to apply.  The PM still says nothing is coming in.  I'm concerned, and not sure if this is normal, or if I should be interviewing other PMs.  I did get this PM as a reference within BP so I had a certain base level of trust going in.