How Long to Cold Brew Coffee: 12 Hours vs 24 HoursCold brew timing explained — 12 hours at room temperature vs 18–24 hours in the fridge. Ratios, grind size, filtering, and how long your concentrate lasts.Frequently asked questionsIs TimerRush free?Completely free — no account required.Where can I try the timers mentioned in this guide?All timers are at timerrush.com. Bookmark /t/25m or /t/5m for quick one-click access.