tags: [] - coffee/brewing - coffee/brewing/fundamentals aliases: - Contact Time - Extraction Time - Brew Duration

Brew Time¶

Tags: #coffee/brewing #coffee/brewing/fundamentals Aliases: Contact Time, Extraction Time, Brew Duration Related: Extraction | ../Maps of Content/Grind Size MOC | Brew Temperature | Brew Ratio | Brewing Fundamentals MOC Status: ✅ Complete

Overview¶

Brew time, also referred to as contact time, is the duration that water and coffee grounds remain in contact during extraction. It is a fundamental brewing variable that directly influences extraction percentage: longer contact time generally increases extraction and shorter contact time decreases it. Optimal ranges vary considerably by brewing method, from 25–35 seconds for espresso to 12–24 hours for cold brew.

Brew Time by Method¶

Method	Target range	Notes
Espresso	25–35 seconds	Ristretto shorter; lungo longer
AeroPress	1:00–3:00	Highly variable by recipe
Pour over (V60, Kalita)	2:30–3:30	Controlled primarily by grind size
French press	4:00–5:00	Steep time set directly by timer
Chemex	4:00–5:00	Thicker filter and larger doses extend time
Batch brew	4:00–6:00	SCA certification target range
Cupping (SCA protocol)	4:00 minimum before breaking crust	Total contact 8–10+ minutes
Cold brew	12–24 hours	Room temperature: 12–18 hours; refrigerated: 18–24 hours

Brew Time and Extraction¶

Longer brew time increases extraction percentage and the quantity of dissolved solids in the cup. Shorter brew time risks sourness and weakness from under-extraction; longer brew time risks bitterness and astringency from over-extraction.

Brew time interacts with other variables: - Grind size: finer grinding slows flow and lengthens contact time; coarser grinding shortens it - Temperature: higher temperatures accelerate extraction at any given contact time - Agitation: more agitation accelerates extraction at the same contact time - Brew ratio: a deeper coffee bed may slow percolation and extend contact time slightly

Controlling Brew Time¶

Pour-over methods: Grind size is the primary control. Finer grinding slows water flow through the bed and extends total brew time; coarser grinding shortens it. Pour rate and technique also influence timing. In practice, brew time is a diagnostic indicator — if total time is too fast or too slow, the grind setting is adjusted accordingly.

Immersion methods (French press, AeroPress): Steep duration is set directly by timer. The point at which grounds are separated (pressing, releasing a valve) ends active extraction.

Espresso: Grind size is the primary variable controlling shot duration. A finer grind slows flow through the puck; a coarser grind shortens it. Dose also plays a role — a deeper puck slows flow.

Time Components¶

Bloom (pour over): The initial wetting phase (typically 30–45 seconds) allows CO₂ to degas before the main brew. Bloom time may be counted within total brew time or measured separately depending on the recipe.

Drawdown: The passive phase during which water drains through the coffee bed after the final pour. Typically 30–60 seconds; difficult to control directly as it depends on grind size and bed preparation.

Pre-infusion (espresso): The initial low-pressure wetting phase before full extraction pressure is applied. Usually 5–10 seconds; not typically counted within shot time.

Roast Level and Brew Time¶

Light roasts have denser bean structure and generally require slightly longer contact time within a method's target range to achieve equivalent extraction. Dark roasts, with more porous structure, extract more readily and are suited to the lower end of the time range.

Troubleshooting¶

Symptom	Likely cause	Adjustment
Sour, weak, thin (pour over under 2:30)	Grind too coarse	Grind finer
Bitter, astringent (pour over over 4:00)	Grind too fine	Grind coarser
Inconsistent times between identical brews	Variable grind, dose, or technique	Improve weighing and pouring consistency

Key Facts¶

SCA filter extraction target: 18–22%; achieved in approximately 3:00–6:00 depending on method
Espresso: 25–35 seconds at 9 bar; pre-infusion not counted
In pour-over brewing, brew time is a diagnostic indicator of grind correctness, not a variable adjusted independently
Light roasts generally require slightly longer brew time than dark roasts at the same grind setting
Grind size is the primary control for brew time in both pour-over and espresso

References¶

Changelog¶

Date	Change
2026-04-30	Compliance review: full rewrite — non-standard tags, bold title in prose, prescriptive skill-level sections, missing required sections, no copyright; Australian English applied

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