to call it a day (to finish working for the day)

Eg 1:

A: It’s five o clock. We have done a lot of work today, so let’s call it a day.

B: Yes, let’s do that. We can continue tomorrow.

Eg 2:

A: What time did you finish work?

B: We called it a day at 4 o clock. We weren’t busy at all.

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What time do you usually “call it a day”?