im sorry it wasnt an EKG it was a sonigram. so even if his artery was 100% clogged they still wouldnt find it.
and in 2001 he had a heart attack and had a stent put in, well in 2008 he had another stress test and they didnt find anything, and now he had another stress test and two day later a heart attack due to the original stent being blocked with plaque.
Results don't take too long, but much depends on what the doctor saw. If there were just minor abnormalities the heart attack timing may have just been a coincidence and having received the results sooner may not have made a difference. A normal stress test is about 65% accurate so it may have given some advanced warning as well. Why did your father have an EKG in the first place? Was he symptomatic?
The results of a stress test don't really take any time to become available to a Cardiologist. Let's put it this way, I was in a ward and had a stress test. Ten minutes after the test was finished the Cardiologist was at my bedside to discuss the results.