I'm not sure I understand the question, but I think you're asking how many times it can be refilled? I top mine off every couple of hours with 10-12 drops (depending on the dropper) and I've been using this one for 2 days. But I only use tobacco type flavors and like the way they blend when I switch. And I'm lazy about re-stuffing carts. I try to devote an evening to it every week, but sometimes I don't. I do 30 or so carts when I do it. That's for 2 of us.
For sanitary reasons and to keep your flavors separate, it's best to only use them for a day, then squeeze the remaining juice out of the filling and rinse the cart, insert new filling.
A box of fluval will fill probably a hundred carts so it's better to throw it away, I think, when done, but some may have had success rinsing and re-using.
Did that help?