Smoking moderately, I'll go through an eighth in 4 or 5 days. usually the smaller amount I buy the easier it is to conserve. If I buy a half ounce i could smoke it in 2 weeks cuz I'd never think to conserve until it was too late and my tolerance was way high. This is why I'm excited for my first crop soon; no more difficult $$ and acquisition issues.
When I need to conserve, I'll do something similar to what rain man originally said about retaining hits in your lungs for as long as possible. Instead, I'll blow my hit into a balloon and pinch it airtight so I can breath and cough if I need to, then I just re-inhale the smoke that is in the balloon. That gets a lot of mileage out of the bud. I did the stats when I first started doing it and I was burning at the most half the bud I normally needed to, sometimes a quarter of the bud.