The stopping changes with different vaporizers, at least for me.
With my gn0me and my genie, i stop when i get the popcorn taste, no visible vapour and medium brown ABV.
With my DBV, sometimes it is still greenish but there is no vapour, no matter how high i crank it so i stop.
With my DaVinci, i start at 185C and crank it in 5º intervals, sometimes i stop at 195C, sometimes at 200C. I stop when i got a fishy smell, brown ABV or after the end of the second 10-min cycle.
In conclusion, i use 3 measures that are present 95% of times when i stop:
- Popcorn Taste or Fishy Taste or No Taste
- ABV colour, usually medium brown
- Lack of visible vapor
If i only lack vapor, i rise the temperature and check again. If my ABV is starting to get brown or the taste is getting popcorny, i crank the heat and stop until no vapour.