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Brewed coffee lasts about 2 hours out of the fridge; add milk and treat it like dairy, with a 1–2 hour limit.

Coffee with milk keeps 2 to 3 days in the fridge for taste; at 40°F (4°C) or colder, discard after 4 days.

Coffee brew time can be 25–35 seconds for espresso or 12–18 hours for cold brew, with grind size and method setting the pace.

Caffeine in breastmilk can keep some babies more alert for 3–8 hours after a caffeinated drink, with longer effects in newborns.

Caffeine from a cup of tea often feels active for 3–6 hours, and it can still nudge sleep later if you drink it late.

Most people flush most caffeine in 24 to 48 hours, but timing, dose, and your body can stretch that window.

Detox from caffeine usually means 2-9 days of withdrawal, while most caffeine is cleared in 1-2 days for many adults.

Caffeine in Red Bull peaks in 30 to 60 minutes, then fades over 4 to 6 hours; sleep timing, body size, and tolerance can stretch it.

Most people feel caffeine’s effects for 3–6 hours, and a late dose can still mess with sleep 8+ hours later.

Caffeine from a regular 12-oz Coke often feels noticeable for 3-5 hours, with lighter leftovers that can affect sleep closer to 10 hours.