I’m an Engineer and have absolutely no finance background. Unlike folks in finance, mine is a laid back, 8AM-5PM job on an average. I prepared for 9-10 weeks, with the last 1.5 week for revision and practice. I would have put a total of 200-225 hours in those 9-10 weeks prep time and passed the exam on my first attempt.
Immediately after writing the test, I felt that I would be on the borderline - either Band 10 or just pass, as I did not have enough time to finish all AM exam questions. But after I saw my result, I realized that I passed comfortably after comparing with other members on this forum. So the study plan did work for me and was not a fluke.
Assimilating L3 material is actually easier than L2 material. But L3 exam, especially the AM exam, is tougher than L2 exam. You probably don’t need much time to absorb the material, but you need soild practice.