Hello Jerry and thanks for asking the Disney Parks Moms Panel such an important question about your families upcoming February 2019 trip to the magic of Walt Disney World Resort!
As the current British Mum here on the Panel I can completely relate to extra pixie dusted and longer
14 day stays at Walt Disney World Resort and therefore like you, making a whole heap of
FastPass+ selections for my family to enjoy.
As you rightly mention Guests staying at select Walt Disney World Resorts who have valid
Disney Theme Park Tickets linked to their
My Disney Experience may begin making an initial
3 FastPass+ selections per day of stay up to 60 days prior to check-in or 30 days ahead of arrival for those Guests visiting daily. I'm also very happy to share that Guests who are staying in a Walt Disney World Resort Hotel can indeed make FastPass+ selections for up to
10 days into their stay which at present is indeed deemed as length of stay. It's easy to make further FastPass+ selections for day 11 of your stay by logging into My Disney Experience 59 days prior to check-in and day 12 the next day and so on until the last day of stay or Disney Theme Park Ticket expiry has been reached.
Magical wishes to you for a fabulous February 2109 vacation to Walt Disney World Resort.
~ Jane