Use 'or so' when you're not certain about the exact number but want to give an estimated range.

Estimation Indicator

'Or so' is handy when specifying time that doesn't need to be exact, creating a relaxed expectation.

Flexible Timing

In informal settings, 'or so' makes your speech sound more conversational and less rigid.

Use 'or so' when you're guessing an amount or number that shows a sizable figure, but not exact.

The phrase can suggest that the actual number may be more than the one stated, but close to it.

'Or so' denotes a vague quantity, suggesting the speaker does not need or want to be precise.