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Most people feel 200 mg of caffeine for 4–6 hours, with lighter after-effects up to 10 hours, shaped by metabolism and timing.

Coffee can raise heart rate for 1 to 4 hours, with the strongest bump often in the first 30 to 120 minutes.

Coffee’s effects usually peak in 30–60 minutes and fade over 3–5 hours, though caffeine can linger in your system 8+ hours.

Matcha caffeine often sticks around 6 to 10 hours, and it can still nudge sleep even when you don’t feel wired.

Caffeine jitters often fade in 2 to 6 hours, yet a big dose or slow caffeine clearance can keep jitteriness from caffeine going closer to 12 hours.

Most caffeine tolerance drops for many within 7–14 days off caffeine, while heavy daily intake may take closer to 3–4 weeks.

Caffeine overdose symptoms can peak in 1–2 hours and fade in 6–12 hours, but severe toxicity can linger a day or more.

Caffeine can show up in breastmilk within an hour and often fades over the next day, with timing shaped by dose, your body, and your baby’s age.

Caffeine can blunt appetite for 1–4 hours, with the strongest dip in the first 1–2 hours after you take it.

Caffeine-related heart palpitations often fade within minutes to a few hours, but a big dose or slow metabolism can stretch them longer.