How Long to Sit in a Sauna: Session Lengths for Maximum BenefitResearch shows 15–20 minutes per sauna session, 4+ times per week, produces significant cardiovascular benefits. Here's the protocol used in the studies.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.