Raw linguica will keep for up to 3 to 4 days in the fridge.
Just like other raw sausage the raw linguica will keep okay and safe in the fridge for up to 4 days and after 4 days the linguica or any other sausage should be thrown out.
The fridge will not keep the linguica or other sausage cold enough to keep bacteria from growing on it after 4 days.
If you want to keep the linguica or other raw sausage or any other raw meat longer than 3 days you should really freeze it instead.
When frozen the raw linguica or other sausage or any other meats will keep for up to 12 months or longer.
The freezer temperatures keep the bacteria from growing on the raw linguica or other raw meats or sausages.
For cooked linguica or other cooked sausage it will usually last for 7 days in the refrigerator and up to a year or more in the freezer.