Did any of them not start out their journey at level 50?
When they level up the get healed to full for free so they may not need to use stimpacks for a while.
Also there is literally an option in the options menu to make a screenshot button appear on the UI.
I'm actually running tests on that right now. I will post the info when I compile it all. It will go something like:
26 "half-healths" (stims heal 50% HP, so 25 stims, then the last half until death)
average HP/hour lost (right now, somewhere around 60 for my lvl 50 at 3 days out)
595 HP for that dweller, so:
595 MAXHP /2 = 298 HP per stimpack
298 / 60 = 4.96 hours per stim
4.96 hours * 26 = 128.96 hours = 5.3625 days till dead estimated
Or, if you use the 60HP per hour, just take your dwellers max hp and:
MAXHP * .2166 = hours till death estimated
This assumes you win every encounter, or do not take more than 60HP damage per hour. Individual resulats may vary
MAXHP * 13 / DMG_PER_HOUR = hours till death estimated
I will also be testing if the type of armor matters, and if other stats boosted matter (beyond 10 everywhere)
The above assumes NO radiation damage.