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Fact · Dictation on Windows

548days

Microsoft's default 18-month conversation retention is about 548 days.

Checked against its source on October 16, 2026

What it measures: Calculated from the cited Microsoft figure.
How it is calculated: 18 months x 365.25 days / 12 months = 547.9, rounded to 548 days
What it does not show: A calculation from the cited figure, not a number Microsoft states.

Calculated from

Microsoft says it stores Copilot conversation activity for 18 months by default, and that you can delete individual conversations or the whole history at any time.

Cited on

Copilot conversation history retention in days | Yap