I don't know about the studios, but booked 14 nights in a 1 bedroom for DD's honeymoon in 2014, and just recently spent 14 nights in a 2 bedroom dedicated. I had no trouble whatsoever booking either at the 7-month mark. The honeymoon was May 25-June8 and the recent trip was May 7-21. Sorry I can't address studios specifically, but if the one bedroom and the two bedroom are any indication, you should be ok. That said, I did book when the 7 month window opened. I did not dilly-dally! ;-)
debg