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Correct.

I think the spine needs flexion and extension, the lumbar extensors are like any other muscle and I think just 240 seconds a week is enough, you just got to be sure the the movement of resistance is right.
 
I'm lucky to get 2 inches below the knee cap. Short hammies and an even shorter sciatic nerve
 
RDL is a much safer option for me in hindsight due to excessive lumbar flexation in SLDL (tight hammy crew checking in yo)