The writing part of the IELTS is a one-hour test consisting of two tasks. Task one and task two. Each task is awarded a band score, and the two separate band scores are converted into a final, or overall band score for the writing part.
You are recommended to spend 20 minutes on task one and 40 minutes on task two. However, it is your responsibility to manage your own time. You may, if you wish, attempt task two before task one: they dont have to be completed in chronological order. It is important to bear in mind, however, that task two is worth more marks than task one. For example, if you were awarded a band 6 for task one, and a band 7 for task two, your overall score for the writing would be a band 7. However, if you were awarded a band 7 for task one, and a band 6 for task two, then your overall score would be 6. Therefore, if you spend too much time on task one, thus not allowing yourself time to complete task two adequately, your overall band score may be affected.