A gram gets you about 3 bowls, so a gram and a half would yield about 5. So however long 5 bowls of similar stuff would normally last you. It really depends on what you are classifying as dank. Most people will say something is dank when it's really not.

Case in point, one person might classify the buds in the bottom two scenarios as dank, but I didn't at all.

Case #1: Got some outdoor Afghani, nice smell, pretty leafy, no seeds, visible trichromes. This is lower than the quality I normally smoke. Went through 3/4 of an ounce in a week with my girlfriend.

Case #2: Purple Urkle. Medical grade. Perfect manicure, perfect cure, pungent nose that carries through on the taste. This is the quality I typically smoke. My girlfriend and I go through about 1/2 oz every 10 days on this stuff.

So as you can see, both may get classified as dank, but one will stretch out the supply, the other won't.