Final answer:
Cold therapy is applied for 15-20 minutes with breaks in between, while heat therapy is used after 48-72 hours for 15-30 minutes at a time.
Step-by-step explanation:
When it comes to applying cold and heat for injuries, it's important to know the appropriate timing and duration. Cold therapy, such as using an ice pack, is typically applied for 15-20 minutes at a time, with a break of at least 1 hour between applications. This helps reduce inflammation and pain. Heat therapy, on the other hand, is usually applied after the initial 48-72 hours of an injury, and can be used for about 15-30 minutes at a time to promote blood flow and relaxation of muscles.