On Earthmate, I can select a 1 second or 30 second logging frequency. IMO 1 second is a bit too fast, but 30 seconds is definitely too slow (for hiking). That could cause the track to miss entire switchbacks, and compromise the total length.
I've read about people setting their InReach to 5 seconds or 10 seconds. Is there a way to do this? Can custom logging frequencies be specified? Then M1 must be able to do it, I guess it's just a question of if the frequency selection interface is too rigid.