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It all depends on your prior knowledge and you availability during your preparation for the exam. For example, I started studying about a month before the exam since I’m a grad student in Quantitative Business & Finance and had basically nothing to do so could devote the whole day to studying. Evidently, if you working or from a different background this won’t be possible.
Rule of thumb: 250-450 hours for CFA1
The range starting from 250 if you have prior knowledge (I’m talking more about educational knowledge and not work experience) in quants AND accounting. Towards 450 when you have zero prior knowledge about both these topics.
This is a general guideline. I recommend calculating you required study time by setting you deadline at least some days/weeks before the actual exam to not have such stressful days as I had the days before the exam.
Good luck!