It does, I thought exactly the same as you and people warned me about WK6 R1 so I took their advice and kept my usual steady pace and it was fine. It's funny how it does it but it seems to work. I'm doing WK8 R2 tomorrow and finding that it's going really well.
I felt the same when I saw the jump from 8 mins to 20 mins and was very apprehensive but go for it- you will be amazed. It really is OK so long as you have built up to it on the plan
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