I don't know exactly how much time passed between 610 and 616 (I'm assuming 6 days?), but I'd say about one day passed within the span of 609-610. In Dark Realm time, that was 28 years. So, if Gideon spent 6 days preparing to open the portal to free Fiona, that would've been about (28 x 6 = ) 168 years in Dark Realm time, right? What would she have been doing to pass that amount of time?
[It does kinda make me wonder how she wasn't more prepared...]