Normal
Not that I have noticed, it's always been a couple weeks before I notice the sac as there adults there on the back of my shelves as I don't need to get to them as often so it's just at maintenance times they get checked or if there is some curious people in. I always leave the phantom sacs like you done. For the T to try and consume some of that spent energy, a phantom sac is great for a T as long as it hasn't gone bad. Usually around day 36 to 40 is when they will eat it in my experience, kinda glad that T's aren't parthenogenetic, got a phantom sac from an LP years ago looked like it was nearly 500 eggs in that one, went bad pretty quick though.