Cat poisoning generally requires observation for 3 to 7 days to confirm that it is okay, because there are two types of poisoning: chronic poisoning and acute poisoning. Acute poisoning usually causes death in a few hours, while chronic poisoning usually takes a few days to die. So it needs to be observed for a few more days.
Tip:
When a cat is poisoned, it is best to induce vomiting immediately and then send the cat to a pet hospital for examination and treatment to avoid missing the opportunity for treatment.