2+2+2 months is the plan on paper. R6 will come out in 3 parts like R5... maybe they should be rebranded R6 R7 R8. I mean release means release.
It went from 3-4 months to 6, but VP will work the same (he does this full time) so there will be twice as much content for the same amount of main story progression instead. So all in all same rate of lewd creation as usual, but delivered a little more frequently and resulting in an end product with twice as much content. Depending on how we measure content because its not the story that gets twice as long but the amount of renders, some of which just goes towards adding detail, plus music, UI etc. But how much of it idk. Did the side content became larger in scope than he planned or perhaps there is time being put aside for animations?
The VERY good news is that we will see Mistress Iris in roughly 2 months.