The first 2–5 minutes feel sharp. That's the mechanism working. After that, the sensation turns warm. Start with thin clothing if you're sensitive.
Start with 5–10 minutes. Build to 15–20 as your body adjusts. 30 minutes is the upper limit per session.
No — 30 minutes maximum. Longer sessions can cause skin irritation.
It fits most. If you need more height, fold a small towel underneath it.
Consult your doctor first if you're pregnant, on blood thinners, or managing a chronic condition. Avoid use on open wounds or irritated skin.