The FP attractions were divided into two groups and you would get three FPs for each set - six total for each member of your party who was present with a valid ticket at the time of birthday redemption. There was no designated time, so you could use them whenever you felt like it that day. When it would print out, it also printed the list of attractions on each of them, so you could pick the attractions at your own discretion (for example, you could use all 3 for Tower of Terror, if you wanted).
Does that make sense?
There I was somewhere West of Tomorrowland
Flying through the stars just like Peter Pan
I said...Dang this looks too good to be true...
It's a nice day when you wake up in Disneyland...
-Five For Fighting, "Disneyland"