Well to be precise, we need to know the actual effect of the working substance in marijuana, which is Chronic. Chronic has a working rate of 2 highs per injection for a duration of exactly 1 trip. So taking into calculation it is not humanly possible to take 2 marijuanas per 3 minutes, due to the Hasj induced OD risks I'd say about 20 marijuana's injected within 1 hour, or 5 in a day.