More than two weeks - but the ultimate test of their commitment: Check the local ambulance corps regarding becoming an EMT. The summer course would be an intense couple of weeks, but besides covering anatomy, and the hands-on patient tasks, it will also deal with liability, state regulatory/reporting requirements, patient rights – all those “mundane” things that will be a good portion of someone’s time but won’t be covered in TV dramas.
Then they’ll likely have to volunteer a day a week - and find out that on many “calls” they won’t be little more than a glorified Taxi, of course interspersed with the occasional “all-in” scenarios.
The good thing is, if it deepens their commitment/interest, they’ll have a great knowledge and experience base that will be a plus on applications. And if it doesn’t, then they’ll have found out before stepping foot into college.