How long does caffeine stays in your system? Cause I have stress test tomor and I ate a piece of chocolate cake at 4 pm

Caffeine . . Caffeine stays in your system about 10 -12 hours . Don't worry though chocolate does not have caffeine in it as far as I know snd it should not affect your stress test results significantly .
Not a problem. Generally, you're asked not to have any after midnight the night before.
Caffeine. Amount of caffeine in a piece of chocolate cake is low. Following oral administration of 100 mg of caffeine as a pill (cup of coffee), peak blood concentration reached after 50-75 minutes. Half-life of caffeine is 3-5 hours, so after 6-10 hours, there is no caffeine in the body. .