Once purchased raw tripe will last for up to 2 days in the fridge.
If you want to keep the raw tripe longer than 2 days you should freeze the raw tripe instead.
When you freeze the raw tripe the raw tripe will last in the freezer for up to 6 months although it's best to cook the raw tripe within 3 months of freezing it.
The raw tripe will stay safe to eat well after the 3 months but it loses it's quality and won't taste as good.
For the best tripe though eat it within a few days of purchasing it.
But a lot of food including raw tripe can last quite a long time as long as it's frozen.