I "aim" for two sessions of 0.75 miles at between 3.6 and 4.1 (mostly on the lower end) on the treadmill. I usually get closeish.

My stamina over the past 18mos or so, when I started this, has certainly improved; I couldn't do much over 3.0 mph for more than a few seconds.
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But it seems to have hit the limit. I'm mostly trying to sustain longer periods near the high end. My weight is stable or dropping, ditto my A1C, so, it works for me.
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