According to the IELTS exam syllabus, the speaking test's Part 2 involves a "long turn" where you are given a cue card and have 1 minute to prepare. You must speak for 1-2 minutes on the topic provided, covering specific points mentioned on the card.
To prepare, practice speaking on a wide range of topics without stopping, as fluency is key. You can also record yourself and evaluate your ability to expand on ideas. The IELTS exam syllabus highlights the need for coherence, fluency, and a good range of vocabulary in this part.