Mo

200 mg of caffeine can delay sleep for 6–10 hours, with the strongest “wired” feeling most often in the first 2–4 hours.

Caffeine from one cup peaks in 30–60 minutes, then fades for about 4–6 hours, depending on your body and timing.

In a sealed bag, coffee beans stay usable for months, but they taste liveliest within 2–4 weeks after opening.

Whole coffee beans hold their best flavor for 1–3 weeks after opening in an airtight container at room temperature, then gradually taste flatter.

An open bag of ground coffee tastes best for about 1–2 weeks, then it keeps fading; tight storage can stretch the good window.

Unopened coffee grounds taste best up to the bag’s best-by date, yet a tight seal and cool pantry can keep them drinkable well past it.

A sealed bag of ground coffee holds its best flavor for about 3–5 months, while most factory-sealed packs stay usable until the best-by date.

Sealed containers keep coffee drinkable for months, but best flavor lasts weeks; whole beans last longer than ground coffee.

Ground coffee tastes best within a few weeks of opening, and it can keep much longer if you seal it well and keep it dry.

Brewed coffee tastes best within 1 hour; for safety, keep it under 12 hours at room temp or 3–4 days in the fridge.