Talk with a local real estate agent or Realtor. Ask them what the average DOM is (Days on Market) for Howell, NJ. Course, it goes without saying if you price it right, it can sell quicker vs longer than the average.
If you have it listed, are you working with any agent? They really need to go over this with you and if not, advise you speak with several and see if you can find one you would like to work with. I know some sellers feel it "costs to much to use an agent", but honestly, make sure you are comparing apples to apples. Most time, I feel (and yes, I understand my opinion is biased) that it can cost you too much NOT using an real estate agent or Realtor.
Best of luck, One phone call to any real estate office will get you the average DOM for Howell, NJ.