Just received my Crafty yesterday so here is a take on fresh batteries with how I use the device:
Load full bowl (around .2), lightly compress. Fire it up and let it heat to my default of 185 C.
When it's at temp I take a ~10 second slow inhale directly to lungs saving enough room for a good gulp to bring it down. Usually light goes red for the last few seconds of my draw. Light goes green again a few seconds before I'm ready to exhale a great cloud.
Repeat that 3-4 more times and then bump to 199 C for 2-3 of the same to finish it off. That's one session for me of around 7 minutes including initial heat up time.
With a full battery I did 3 of those sessions last night and could have probably squeezed a 4th out but 5 might be stretching it. That's perfect for me as I have the Mighty as well as a 15,600 power bank that should charge Crafty 5 times.
Edit: have had one session so far with Crafty today on full charge. For science I will attempt 4 + more sessions in the next 6 hours before zzz and see if she turns off on me.
Edit 2: second session down. Again, 5 draws at 185 (used stopwatch, more like 12-15 seconds) and then 3 at boosted 199C. Third exhale from 199 was pretty thin. Checked battery through app just before I turned it off, still 5/6 but i'm sure that 5th is going to drop as soon as I turn it on for session 3. Stay tuned for an after dinner report!
edit 3: third session down, total time turned on was 6 mins 2 seconds, have 3/6 on battery at the end of that session. Same as before, 5x standard, 3x boosted.
edit 4 (final): 4th session ended with 2/6 bars, same amount of draws at same temps as always, tried a 5th session, got through my 5 draws at 185 but after turning on boost, it powered off while trying to hit 199C. Took one last post mortem draw and emptied her out to put on the charger.
All in all, I'm very happy if I can get 4 full (my) sessions per charge.