As others have said I think you need to talk with the manager and get more insight into how they came up with that number. I think it would also behoove you to

As others have said I think you need to talk with the manager and get more insight into how they came up with that number. I think it would also behoove you to white board some about the bug and be able to try to fully understand 1) what is happening 2) why is it happening 3) be able to fully understand the code that contains the bug if possible. I dont know what the bug is that you are dealing with. It could be a low level driver or enterprise web app. I cant emphasize enough that its important to be able to understand that problem, and that usually means you can make a map of the problems inputs and outputs work flow etc