How long should coffee rest after roasting before drinking?

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Filter coffee needs 7–14 days of rest after roasting, espresso 10–21 days. During this time, CO₂ degasses which would otherwise disrupt extraction. The coffee should be consumed within 4–8 weeks. Freshly roasted coffee contains large amounts of CO₂ produced during roasting by chemical reactions (Maillard reaction, caramelisation). This gas sits in the bean's cell structures and escapes gradually after roasting — a process called degassing. Why is the CO₂ a problem? During brewing, the escaping gas creates a barrier between water and coffee particles. The water can't dissolve aromas evenly. With espresso, the effect is particularly strong: too-fresh coffee produces an unstable, overflowing crema and tastes unbalanced — often simultaneously sour and bitter because extraction runs unevenly. Rest time depends on three factors: Roast level: Dark roasts degas faster because the cell structure is more broken open. A dark espresso roast can be ready after 7–10 days. A light filter roast often needs 10–14 days because the CO₂ escapes more slowly. Brewing method: Espresso is more sensitive to CO₂ than filter coffee. The high pressure (9 bar) forces water through the puck — if too much gas is escaping simultaneously, extraction becomes chaotic. Filter methods are more forgiving because water flows through the coffee slowly and without pressure. Packaging: Valve bags let CO₂ escape without letting oxygen in. In sealed tins without a valve, the gas builds up — the coffee may need a few more days after opening. The window of optimal freshness is limited. After 4–8 weeks, the coffee has lost enough aromatic compounds through oxidation that it tastes flatter. This isn't a hard cutoff but a gradual decline — though after 8 weeks the difference from fresh coffee is clearly noticeable. I tell guests: if you take freshly roasted coffee home, give it a good week of rest. The coffee gets better day by day — until it hits its peak at 3–4 weeks. Then drink it promptly. Stop by Sophienstraße 27 in Berlin-Lichtenberg — Mon–Fri 8am–5pm, Sat 10am–5pm.

How long should coffee rest after roasting before drinking?

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In practice at Green Wall Coffee

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