I am also here as a web developer, I also work with the target there is a target time from the client, in case of any delay we can give an appointment. so the client also will not ask on, because there is certainty when a project will be completed ,. maybe you can also explain at least when, though I as a web developer had trouble in the making but the client did not want to know, because they do not know what, all they want is the job done,