[jacquesm]

4 Years is getting to the point of having to admit defeat, though there are examples of companies that hit their stride that late or even later. The biggest - and most important to me - indicator is if there is a trend or if it is flatlining. If there is a trend and you have the stamina keep going, if it is flatlining or even declining it might be the point to throw the towel in, but first have a chat with some other people to see if they can spot something obvious (but not obvious to you!) that you might do to improve things.