在英语中，人们会用“It 's been a long day”来表达疲劳（fatigue）。
native speaker 1:
It means that the speaker's day has felt long and usually hasn't been very good.
native speaker 2:
If someone's had a long day, it means they're very tired from something like work or school and want to finally rest.
native speaker 3:
Their day was extremely busy,a spouse may respond with this when they return from work and were busy. insinuating that they are tired.
You know, I’d like to help but it’s been a long day and I just don’t think I have the time or energy to get involved.
I’m sorry, but its been a long day and we’re about to close. Come back tomorrow on the morning and you’ll get better service when everyone is fresh.
Its been a long day. Why don’t we get back to this work tomorrow. We should go home, relax and get some sleep. We’ll work more effectively in the morning after some proper rest.