My severe sunburn is mostly healed. I spent 3 hours by the pool in my new swimsuit, with some usage of a wrap when sitting by the pool chatting, and no additional damage was done. Before the big 3 hour stretch, I several times put on my new swimsuit and spent 5-10 minutes outside getting moderate non-damaging exposure to accustom my skin that was covered by my old swimsuit to the sun.
I think the minimalist runner mantra of "Listen To Your Body" applies to sun exposure as well. When I burned two weeks ago, my skin felt like it was heating up and loosing it's ability to self-regulate, but I put off getting into shade because I was having fun and kept wanting to do just one more thing... Sunday at the pool I kept my wrap handy and covered my shoulders and head at the first sign of heat in the skin, and gave it a little time to recover before getting more sun.
I've also been considering what I've already read about sunlight and melanoma risk. Statistical studies show that people with a history of sunburn are more likely to get melanoma, but they have had trouble reproducing this in the lab rats. What else to people with a history of sun burn do? They avoid the sun! Is the burn itself, or the avoidance of sunlight that does more damage?