It didn't takte to long, its the third one that I've built. Its so smooth you wouldn't believe it. I'm gonna add an optional nitrous cracker in the ront chamber to propel the smoke. as it is its got al adjustable flow valves to maintain the symetry of the bubble quadruple one way valves, dual exhaust. i fuckin love this Bong. I should post some pictures of some of the other bongs Ive built.