@LuckyGuy is the champion so far, but I come close. My son and I are both prone to allergies, and when the air is bad I can go through half a box in a day. When a real cold hits, it’ll be more than that. And when I need a tissue, I typically need it fast.
Right now: 1 each in kitchen, dining room, living room, husband’s room, my room, front bathroom, back bathroom, son’s bedroom, other son’s bedroom; 2 in our bedroom. That makes 11 in the house.
There’s one each in both cars and one that I know of in the garage: 14 accounted for, in all.
I’m not counting the pocket packs, which abound in purses, tote bags, luggage, etc.
When the supply in the hall closet goes below a dozen full boxes, Kleenex becomes an urgent shopping list item.
I am glad not to have been born before the advent of soft, disposable (and flushable) household paper products. I have on occasion been shown to a small outbuilding where the remains of a Sears catalog hung from a nail. Thank goodness those were just rustic outings and not a way of life.