Are you scheduled for a standard treadmill test or will it be chemical? I've never had the chemical test but I would think it would take longer. There are different types of stress tests. You might want to ask what they're planning to do. Some involve an echo at the same time.
I've had this test twice. They inject you with a radioactive tracer that lets them image your heart and take pictures using a special camera before and after the stress test. The "stress" part of it lasts only a few minutes. It's painless, if somewhat time-consuming.
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