My mates and I (from south australia) all go halves in oz per week. (each couple buys a half. High grade here is 250 per oz. But we are the weed capital being in SA) The half oz will last my fiance and i one week, perhaps a day less if we rage out our mates too.
My mate and his brother go through the same as us, as does my other mate and his room-mate. The strange thing is, we all smoke COMPLETELY differently.
My fiancee and I space our smokes out like you do, smoke 2 to get started, (oh btw i "snap" the bongs too...sounds like soft suction, then the bowl gets blocked, you see the cherry go through the last piece of weed the SNAP bowls clear. RECORD YOURSELF DOIN IT...you can actually see the red hot cherry come out the bottom of the stem, and move around in the water for a tiny bit then go out.). So after the first 2, we have one whenever we remember we havent had one for ages. Usually about 3 hours for the good stuff, if its crap and bottoms I think i would just be hitting the bong constantly.
My mate and his room-mate dont smoke anything till after work, but then smoke the same as my fiancee and i did in the whole day, in a couple of hours.
And my other mate and his brother, the brother is like myself n missus, mate has one before work, to see him through the boring ass morning, then once he gets home he hits it a bit harder.
Have you guys also noticed though, as you start to run out you smoke a little more? When we first get a new oz we are prett conitant with how much we go through, but towards the end of the week as we start to get low we seem to increase our intake. I think this is because even though we have no reason to, we are stressing "oh no we are running out" the stress kills the buzz a little so we have another cone.
Getting ourselves perpetual will be interesting. If we still go through the same trend once we are self supplying 100% its not stress it must be something else. Perhaps the weed is getting too dry by that point or something.
prot