Best sensor type and value type for sleep duration...

[Tetnobic]

Hi,
I try to made a sleeping battery node that wake up every X minutes for send data sensor...
I dynamically set the duration of sleep (send message from gateway) and store in eeprom.
My node do a smartSleep for enable receive function and send current value of duration at setup, no technicaly problem on this...
My question is what sort of message match best for this case ?
Currently I use :

MyMessage msgCustom(NODE_CHILD_ID_CUSTOM, V_VAR1);

because I have no found in documentation a value type for duration (in milliseconds or seconds)
it's the best choice ?

Thanks

[Yveaux]

@Tetnobic sleep duration is in milliseconds, thus X * 60 * 1000 for your case