Faster is better — but it may not be fast enough. Although a piece of food does pick up more bacteria the longer it’s on the floor, bacteria can attach to it instantly. So any food that makes contact with the floor can get contaminated if conditions are right. And foods with wet surfaces, like an apple slice, pick up bacteria easily.
No need to worry if your floors are clean but if they aren’t simply clean your floors with FungiSolve you can be assured the 5 second rule can be applied.