Short answer: the Harvia sand timer runs for 15 minutes, has a wood frame with glass sides, and costs $22.70. It is the simplest way to time a sauna round without a phone. The duration is fixed, so you count flips for longer or shorter sessions.
Why 15 minutes?
It is a common length for one sauna round. Many people do a round, cool down, and go back in. One full run of the sand is a round. If you prefer 10 minutes, leave when about a third of the sand remains. For a first session, shorter is better. Leave whenever you feel dizzy or unwell, whatever the sand shows.
Why not use a phone?
Phones and smartwatches aren’t made for sauna temperatures, and heat is hard on their batteries. A sand timer has no battery and nothing to fail. It also removes the screen from a place where most people want a break from one.
Where should it go?
Mount it where you can see it from your usual seat, at about eye level. Keep it away from the heater and off the wall directly above the stones. The sides are glass, so place it clear of the door and out of reach of a swinging ladle. If children use the sauna, mount it higher.
Run the numbers
At $22.70, it is one of the lowest-cost items on this site. The Almost Heaven Sand Timer costs $54 and its listing doesn’t state the duration. The Harvia tells you what you are getting for less than half the price.
What the listing leaves out
The Sauna Place lists it at 11 3/4” x 2 3/4”. The listing doesn’t say whether mounting screws are in the box. The price and the button both come from The Sauna Place.
What about a heater with a timer?
Many electric heaters have a built-in timer that switches the heater off. That is a safety cutoff for the heater. It doesn’t tell you how long you have been sitting. The two do different jobs.
How it compares
Bottom line: buy it. It is cheap and useful. Sauna Timers: How to Time a Session Without a Phone compares the other options.
