How often do devices communicate

I’ve tried searching but haven’t found much

How often do devices ping each other? Is it different LongSlow vs Short fast?

I did my first longish range test from a TBeam on top of my house to a park about 900 meters away with trees in the way. I was getting about snr:7 with LongSlow, but it would only check in every ten-fifteen mins, or that is what the Meshtastic app showed at least.

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The default position update is 15 min
You can change it like so:

meshtastic --set position_broadcast_secs 0


0 means default- 15 min, but you can set another value.

I would suggest you to play with the Smart positioning, if you will be on the move.
Just read the article above.
Just mind the notes regarding channel utilization etc.