You should expect your firestop sealant to last around one year before you might have to reapply it, but this can vary depending on the amount of exposure it has had with heat or flames so keep an eye out for signs of deterioration in order to get a better idea of when you may need to apply more. If any cracks are visible then these could lead into larger openings that would allow smoke particles through your walls along with toxic gases- neither one of which are good things if living inside! It’s important not only for safety reasons but also because of the damage that can occur to your walls and home if you don’t take care of this as soon as possible.