Sometimes I study 3 hours a day, sometimes I don't study at all. In general, studying for 3 hours is not much different than not studying. I wonder if I can read one novel that is not that long. Unless that one book is a special book, you can't expect it to have a big impact on your life.
But what if this is a difference of 100 days? If you study 3 hours a day for 100 days, it will be 3 x 100 = 300 hours. If you don't study at all every day, 0x100=0 hours after 100 days. No matter what you multiply by 0, it's 0. In the end, the difference is 300 hours. Similarly, 3 hours x 5 years = 5250 hours. 0 hours x 5 years = 0 hours. If you change your daily study from 3 hours to 6 hours, 10,000 hours = 6 hours x 5 years.
Continuation is power. There is a story that if you put in 10,000 hours of effort, you can become a professional. This is the 10,000 hour rule. However, please feel free to use your time. However, if you allocate 3 hours every day to work, hobbies, or study, you will gain incredible experience and knowledge in a few years. I wish you good luck. See you soon.