BLE Mesh Deep Sleep and RTC Setup

Hi,

I am using Mesh of 30 nodes with avg Current Consumption 6mA and 2mA in sleep mode(by calling k_sleeps) , timer is 1s timer is running to keep Real Time incremented.

Want to achieve Deep Sleep current in micro amps, while in deep sleep time needs to be incremented.

I thought RTC would consume less power than timer(if i am correct?) but not able to get RTC working , also no sample code available.

I also tried to reduce the Tx power assuming it will save power(need 6 to 7 mtr range only) but that also doesn't seem to working

Please help to get RTC working and reduce TX power to save energy and other available configs for low power in deep sleep.

Thanks in advance!

Edit:

Using SDK and Toolchain v2.9.0