1 - My high is a Three from that much... lasts a good hour that way, then drops to near zero in 3 hours.
2 - I vaporize (lightbulb vaporizer)
3 - Probably a 2.5... Hell, I'll even say a 3. It is Trainwreck... practically no seeds... 2 seeds in a quarter oz. on average.
4 - I only smoke one or two times a week.
Just as an aside, I actually get a little higher from the same amount in a joint... maybe a 5 or 6, but I think a lightbulb vape can be inefficient compared to commercial vaporizers.