Cdnuts, for someone with palish skin and a family history of melanoma, do you have any suggestions to the format we could do this?

So in winter, how long per day should we go out shirtless for? And should we build up to this time even in winter?

And summer, any recommendations on the amount of time that would be safe after our winter build up?

It's summer here in Aus at the moment, so I might need to adopt a slightly different strategy to begin with.