For the conclusion, the mouse poison does not expire but it is useful for as long as it is attractive for the rodents. So, if you are willing to keep it as suggested, it will last for a decade, until the attractive smell disappears.Click to see full answer. Likewise, people ask, how long does Tomcat bait last?A mouse or rat will normally eat a lethal dose of Tomcat bait in a single night’s feeding and will begin to die in 1 to 2 days. All Tomcat bait stations have a see-through top so you can monitor bait usage, but a rodent requires a very small amount of Tomcat baits for a lethal dose. can rat poison go out of date? You may see some rodenticides lose half of their concentration in a couple of years. At NO point does this mean they are good to eat or should be treated as non-poisonous. Most rat poisons after expiration will still work, but not as well as when fresh, due to the reduced concentration. In respect to this, how long do mouse bait stations last? A: With Victor® Fast-Kill™ rodent baits, once a rodent has consumed a lethal dose, it will die in 12 hours to 2 days. Additionally, once the rodent consumes a lethal dose they will stop feeding which greatly reducing the risk of secondary poisoning. Victor® Multi-Kill™ baits will kill a rodent in 4 to 5 days.Can mice move bait blocks?In general, rodents have more of a tendency to translocate (i.e., move a rodenticide) a bait out of their burrow, if the bait is large in size and is easily movable. Obviously, packet style baits and whole bait blocks can be easily moved, carried or pushed about by rats.