When a job says "unlimited time off" ask what their average usage is. Ensure you match it. Minimum.
When a job says "you get X days off" use them. Keep a sharp eye on roll over limits year-to-year, leave no hour behind.
These are not health or mana potions to save for a boss fight.
Do not answer your phone on vacation. Do not check your email. Do not feel the need to explain.
I took last week off because I hadn't played Super Mario Bros. 2 in a long time and I said, "This is a good week to play Super Mario Bros. 2."
I regularly take off at least 1 day to have my hair done. Hair! I could have it done on a Saturday, I don't, because Saturday's are my time. Hair time is hair time.
Sometimes I take a day off because the weather is frightfully good or frightfully bad.
Do you remember how cheap movies are during the day, during the week, around lunch time? At least once a month I take a day off to go to the movies and eat snacks and cavort slowly and casually.
To hustle is to make your boss richer.
To lazily sashay down a boulevard with a fizzy water and no plans and less thought? Divine.
Time off is not a reward.
Time off is part of your compensation.
The fancy business term for this is "Employee Value Proposition." It is the sum of the question, "why do you want to work here" -- money + benefits + etc.
If you are in an interview and someone says "why do you want to work here" and they are a suit person, say something to the effect of, "Your employee value proposition is significantly higher than your competitors. I value X, Y, Z of your compensation package, firm's reputation, product's reputation, and the current course of your management team."
If you do not have time off, or enough time off, I wish for you an expedited and profitable exit to a situation where you do.