Adopting Japanese life style elements

[Angrboda]

16 years ago I went to cooking school. Food poisoning, if it's going to happen, will occur within 8-10 hours after digesting the offensive meal. By 18 hours, what you ate, is out of your system, though the effects may not be. Food does not stay in the gut for weeks. Your body breaks it down using acids and the good bacteria in your gut, takes what it needs, nutrionally, then the rest is moved through the intestines and turns into waste.
If what you ate a week ago is still in your belly, that's not a good sign.

Diseases like Listeria and Mad Cow Disease are caused by bacterial infections through food poisoning.
Incubation rates can be years.

Mad cow disease is caused by prions. It's not bacterial.

The infectious agent in BSE is believed to be a specific type of misfolded protein called a prion. Other theories state that the agent is a virus,[14] virino,[15] Spiroplasma species, or Acinetobacter species.[16] Prions are not destroyed even if the beef or material containing them is cooked or heat-treated. Prion proteins carry the disease between individuals and cause deterioration of the brain. BSE is a type of transmissible spongiform encephalopathy (TSE).

https://en.wikipedia.org/wiki/Bovine_spo...phalopathy