It’s obviously good to have an employee who takes deadlines seriously and who plans his or her tasks so that they don’t drag out. Nonetheless, it is inevitable that unexpected challenges will arise from time to time, which put the schedule under pressure. Here it is important not to let stress and frustration get the better of you. If you choose to mention your impatience with the long haul as a weakness, you also imply that you respect deadlines and prefer tasks to be completed on time. You can also make it clear to the employer that you are conscious of the need to keep up your motivation when projects drag out. Example: “My greatest weakness is that I get impatient when tasks take longer than expected. I prefer deadlines to be met, and I feel stressed if a task is not completed on time. So I try to be proactive about any problems that may arise from a task, and I’m conscious of not letting my negative feelings get in the way of my motivation.” Your possible future employer may not like the fact that you get stressed out easily if things don’t go according to plan, but will be favourably inclined towards a candidate who thinks proactively and strives to deliver on time.