Tanning question?

okay so my legs and stomach are pretty brown, like really tan. and then my chest and up isnt tan at allll. if i go tanning tomorrow, how long should i stay outside to get a tan on my chest without getting burnt? and should i go in intervals like 10 min go inside 10 min go inside... etc. ??
Update: i didnt mean in a tanning bed... im 13. i meant tanning outside..
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