Respuesta :
To overall get darker you should lay on your back from at least 20-30 min then flip to your stomach and do the same for 20-30 min.
More than 3+ hours in the sun can run the risk of it giving you a 1st-degree burn, otherwise known as a sunburn.
If you play sports, take advisory to the temperatures of that day. Bring plenty of sunscreen and water!
(Also, please be sure to ask this question in the "health" category next time..!)