Final answer:
Stable angina typically lasts for a few minutes and improves with rest or medication. Unstable angina, on the other hand, can last longer and requires urgent medical attention.
Step-by-step explanation:
Stable angina is a type of angina where pain is triggered by exertion and improves quickly with rest or nitroglycerin. The duration of pain in stable angina typically lasts for a short period of time, usually a few minutes, but not longer than 15 minutes. However, if the pain lasts longer and occurs at rest, it may be an indication of unstable angina, which requires immediate medical attention.