I noticed some promotional blurb for someone's tango classes on Facebook today which made the rather bold claim that which prompted me to think about whether Malcolm Gladwell's '10,000 hours to master a skill' rings true, in general, and to tango, in particular. As it will take 27+ years, assuming sustained effort of an hour a day, every day, to achieve this mastery, I suppose we might hope for more than 'the basics' in such a time, but what are the basics, and having mastered them, is there very much left to learn? Is this an example of Pareto: 20% on the list of tango skills representing 80% of the dance - or is it the other way around? Reaching the point where social dancing is no longer embarrassing, and might even be pleasurable, probably doesn't take very long: but mastery - even of the basics? What does that take?