I last smoked just over 2 weeks ago, but it was VERY good quality hashish, and the week before that some excellent Hydroponic weed. I would say that before that I was a regular user for several months.
It must be understood that dilution techniques (in any configuration) can backfire if the THCA concentration in the bladder is too high. For most longtime daily users, its virtually impossible to dilute that high concentration without overdiluting, which would send up the red flags at the lab.