Hello Debmalya,
The key behind success isn't how much time spend behind your study. Rather success lies in how much quality time you spend each day during which you do solid study, learn new concepts, solve unknown mcqs etc. 4-5 hours of quality time daily is really good if you start your preparation early and consistently follow your study schedule.
Best of luck!

It depends on your grasping power
One can learn a topic in 2 hours while others need 4 hour for same
It depends on your capacity If you can stay focused and concentrate for long hours go for it
Extra hours with exhaustion are meaningless

Try to increase your working hours day by day
You can go upto 12 or 14 hours or even more
But by focused 10 hours work also it's achievable

Do meditation for better results

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