How much time is needed in the sun to get enough vitamin D?

Optimal would be a minimum of 1-2 hours for whites 3-4 for in betweens (darker the more) and 5-6+ hours for blacks

At least an hour but preferably all day

You should really get sun as much as you can for the full benefits of it like mitochondrial atp functionality boost, serotonin to melatonin production, circadian rythmm regulation, the betterment of neurotransmitters renewal, etc. 15m to 30m is enough. 15m if you're white and 30m if you're of a darker tone, location doesn't really matter as long as there is a clear sky and there's sunlight. 2h to…