How much data is used during resynchronization? I haven’t found it in the documentation/community.
I need a relative time accuracy, and I execute Particle.syncTime() function. I don’t really know how often should execute it. Once an hour? Once per day? Depending the data consumption I can set a compromise between accuracy and cost.
I wouldn’t think you would get much time drift over just 24 hours.
Unless you get the second accuracy I wouldn’t think you would need to update at more than every 24 hours.
Feed the BAT pin 3.3v and you can use the built-in RTC to hold the time while in deep sleep which should also help reduce the number of times you need to re-sync the time.