But you can in Sims 4 add more vacation days if you want to while your sim is still want to be on vacation. Unless you are talking about actual days your sim can take off or vacation from school or work, that you go day by day.
The only way to check it in The Sims 4 is to click on your phone and choose Extend Vacation. You don't have to extend it, but in the panel that opens up, you'll see how many days you have left. (Yes, that means sims age while on vacation)
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You don't. You'll get a notification before the last day.