Nope, that's not the way it goes Abby!
This is how the MG expert's I've known explain it. Mestinon kicks in anywhere from 20 minutes to 1 hour after you take it. It's more like 30 minutes with the Mestinon Syrup. How fast it goes to work depends upon your GI tract, peristalsis, metabolism, etc. Then the "full strength" of it lasts about 2 hours and then it wears off to varying degrees. For me, it kicks in within 30 minutes, I have about 2 hours of good use and then it rapidly wears off.
I can only guess as to why Kasper's doc was doing this. I cannot imagine a good enough reason to take someone's MG on a ride.
Hope you are doing okay, Kasper!!!
Annie