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The amount of time caffeine stays in your system can vary based on several factors, including your age, body weight, metabolism, and how much caffeine you consume. However, on average, it takes around 5-6 hours for half of the caffeine in your system to be eliminated. This means that if you consume 200mg of caffeine, which is roughly the amount in a typical 8-ounce cup of coffee, you will have approximately 100mg of caffeine in your system after 5-6 hours. However, caffeine can stay in your system for up to 14 hours for some people, particularly if you are sensitive to caffeine or if you consume large amounts. It's important to note that caffeine can interfere with sleep quality, so it's best to avoid consuming caffeine within 6 hours of bedtime. Additionally, caffeine can have different effects on different people. Some people may feel the effects of caffeine quickly, while others may take longer to feel the effects.