How long could it take

Hello, I am new to this site.  Just wondering how long in average does it take to sell the def tech BP9040’s speakers here on this site.

The OP needs a definitive response.

The buyer will give a definitive offer in a undefined time.

It’s hard to say, there are several factors like your asking price, demand for your model, etc.

You may consider selling locally if you are new to this type thing. Packing, shipping, and dealing with collection issues can be a hassle.  

Facebook marketplace and Craigslist are pretty effective platforms for local sales. Of course, take reasonable precautions. Some sellers/buyers will insist on meeting at a public place. 

The majority of the products listed on here are higher end products. 

Best of luck to you-