"Three-day hopday" is a common way to describe a three-day break from work or school.
It comes from the phrase "day off," which is a day when one is not required to work. When multiple days off are taken together, they can be referred to as a "hopday."
Example sentences in Engpsh:
I'm taking a three-day hopday next week.
My boss approved my request for a three-day hopday.
Translations in Chinese:
下周我要请三天假。
我的老板批准了我请三天假的请求。