9 minutes of full noon sun daily is all you need (if have white skin and believe that 10 ng is enough) – Aug 2018

Getting enough vitamin D? You need far less sun than you might think Cancer group in UK

25 minute if have darker skin and still believe that 10 ng is enough

Reporting on

• Meeting Vitamin D Requirements in White Caucasians at UK Latitudes: Providing a Choice April 2018
   Download the PDF from VitaminDWiki