Hi Rupesh,
I have the understanding that the NTP configurations are already in place.
In this case you could enable "ip nbar protocol-discovery" on the interfaces where you are interested about bandwidth consumption.
The "show ip nbar protocol-discovery" command will show you (among others) the number and byte count of NTP packets that have been input or output on the interface during the period since nbar protocol-discovery was enabled.
From these data you will be able to calculate the average bandwidth consumption of NTP for each affected interface per direction of flow.
Cheers:
Istvan