How long in years should I go before I give up and close down a business that is unprofitable?
Before you think about the business not being profitable, have you considered some other factors that might have constitute to the poor performances you've experienced, have you checked in within and without to know what are the possible causes to the poor performances, one thing to observe is that if you never know the causes of this poor outcome, you will still have same experience even when you introduced a new business to set in.