When I first started I would hold it in for about 10 seconds. And to be honest, after realizing that one does not need to hold it in for so long, I've had much more clean-feeling highs. In other words, much more enjoyable. Plus, you get a better after-taste of the herb (given that the aftertaste is good, which it usually is if it is well-cured - of course, that is not for all strains. Some strains have some weird and gross aftertastes! But don't gip yourself out of the awesome aftertaste of that Strawberry Cough, baby!).