What is the optimum awake time for digimesh syn sleep mode

I have a properly working 10 digimesh (S3B) nodes network. Maximum possible hops is 3. They are configured to operate on syn sleep mode. I am using 30 sec awake time every 5 min for each node to send 12 bytes of data to the Connectport x4 gateway. ( all configured using Idigi Dia)

In order to get the maximum power efficiency , what are the sleep and awake time I should use for this set up.

I saw nodes are sending data every 20 sec in “google cloud platform” in a 500 nodes network ( not digimesh though)

Any help would be very much appreciated.

Jagath ekanayake