Fridge life of sauce/condiments
For starters, it is not the expriy date. For anything perishable, it is only relevant for the sealed bottle (and that not only for condiments) and does not have a meaning after you open it. If it is nonperishable, it is simply a best before date and irrelevant for safety. 

So there is no single answer to your question. Some will be highly perishable and fall under the 3-5 days rule for cooked foods, others will keep forever, and some will be in the middle. You have to look everything up in a shelf life database like StillTasty.