A practical tanning timing rule
Pick a window where UV is present but not at the highest band of the day. For many locations this means earlier morning or later afternoon, but the right answer depends on season, latitude, altitude, clouds, reflection, and your skin.
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UV 0-2
Usually too low for meaningful tanning progress, though reflection and sensitive skin still deserve care.
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UV 3-5
Often the most manageable band for a short, monitored tanning window with protection.
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UV 6+
Burn timing gets shorter. TanPilot should shift from “how long can I tan?” to “how do I reduce burn risk?”