Hi raja521,
Sometimes, it happens that Mac takes more time to start up than the user expectations. I suggest you to reset your NVRAM in order to reduce its turn on time.
In order to reset your NVRAM, perform the below mentioned steps:-
1. Shut down your MacBook Pro.
2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
3. Turn on your Mac.
4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
6. Release the keys.
I hope, it will resolve your problem.