I don't really buy the 4, 5 or even 6 times a day dilation schedule. To me it just doesn't make any sense. But I am not a Thai surgeons girl, so I don't have to maintain 7 inches. Only 5, which takes only 2 dilations a day. The 7 inches might require more dilation, as it is some tricky surgery to go beyond the douglas pouch. Penile inversion has a 5 inch physical limit. Go beyond that, like Thai surgeons do, requires a risky surgical procedure when approaching the douglas pouch, the sack where organs are being held in. I can't imagine dilating into that space, I think it would hurt.
Also, depending on the bladder volume, it might weigh down on the neo vag. And the pelvic area where the muscles are located, are not used to so much stress. Then there is another physical limit of diameter, dictated by the pelvic muscles. From what I have read it is about 1.8 inch. Making it more difficult to dilate, or creating the sensation that the neo vag seems to close. I don't believe the neo vag will close so quickly. Maybe after a week of not dilating it might become more rigid, but skipping a day? I don't buy it, unless it is made of 100% penile skin and no scrotal skin was used.