Exclude Objects from SSR Reflection

So this is giving me some results:


 
 BRANCH if( HitUVzTime.w < 1 && HitUVzTime.z > 0.02 ) 

But I don’t understand why we test for greater than … isn’t HitUVzTime.z the ray length, so it should be smaller than a certain length ?
And it of course takes the whole raylenghts from the Viewport and not from the Reflection surface. We want to archive that every reflection ray of our reflective surface longer than 10cm is not giving any SSRs. Is this even possible ?