Experts in the field regularly state that 4 weeks is around 99% conclusive for the 4th generation test. If you were to have a real risk, however, you can choose to go by the 4 or 6 week guideline. It isn't really going to make much difference.
And of course no one would recommend a DUO test before the window period is over, so obviously the initial test would be at 4 weeks, or 6 weeks, whatever the individual prefers.
The question has been fully answered, and there's no point in continuing this conversation.
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And thank you CurfewX I appreciate your input as well as I'm sure anyone seeking clarification on this matter will.