One joint of Cali medical kept me high for 2 weeks.
I would sprinkle a tiny bit in my bong for my first hit of the day - a bit less than the size of my pinky nail - and be high for 3-4 hours. Then, a bit more would get me high for another 3 hours. Then, I would vape about double the original amount and have a nice mellow high for 3 more hours. I was high all day, nearly every day (though 3 or 4 days I only got high once).
I have very low tolerance, and I like it that way.
I once got a half ounce (14 grams) of hashish. Pretty good quality stuff, I thought, though it was made from leaves and stems only. (Around 2 pounds = 1 kg of leaves and stems went into making one ounce of this hash.) It lasted me around 8-9 months of getting high 1-2 times a day, and I gave away the final gram or two since I was moving.
When I was in California recently, one hit from a pipe was a bit too much for me at first, though with daily practice I soon learned to deal with it.
For economic and health reasons, I prefer to keep my tolerance low.