User blog comment:Xilinoc/Ch. 604 - REVITALIZE/@comment-24384892-20141106164827/@comment-5398287-20141110234017

You're correct, but I'm not sure about Vollstandig taking a matter of days to achieve. Giselle implied that Candice just achieved hers, and she's been a member of the Wandenreich for who knows how much longer than Uryu has. It seems similar to Bankai in the amount of effort and training it takes to achieve, and given that only Hisagi has been "confirmed" to have achieved Bankai in this same period of a few days, and he already had the potential to begin with due to how achieving Bankai works...I'm not so certain.