This is a fun topic to discuss, because I think there is a lot of grey area in here. And that's even IF you buy into the 10000 hour rule. First off, why would the clock only start ticking after residency? By the time you are done as a resident, you have already practiced medicine (be it, under guidance, for 4 years). Saying this defeats the whole purpose of what you're looking at: i.e. training for expertise. It begins Wayyyyyyy before end of residency.
I mean, it's all opinion of course. But for example, a pilot, flight hours, do you only start counting hours once you are flying 747s from LA to LHR? I would think NOT. Does a police officer only count expertise AFTER his first year or two "on the job?" If you are doing something, whether taking a H&P or blood pressure, or inserting a catheter, or intubating a patient, why would doing 84 intubations as a 2nd year or 3rd year anesthesia resident NOT be counted toward the expertise clock?
Also, 40 the OP mentioned 40 hours per week? This seems very far off from ANY residency program I know of, or any resident I've spoken to. Let's assume 60-80 hours.
When I watch fellows do valvuloplasties at work, they are ready to do this on their own in private practice. They have done 7 PGY years after med school. I'm not saying they are an expert like an attending who has been an academic for 20 years, BUT, they certainly have many hours toward that clock.
Anyway, that's just my opinion to spark further discussion.
Best to all,
D712