You want to group each user's clicks into visits that end after 30 minutes without a click. Which window fits?

Options

• ✗ Tumbling window of 30 minutes
• ✗ Sliding window of 30 minutes
• ✓ Session window with a 30-minute gap Correct
• ✗ One global window

Why

Session windows have no fixed length: each closes after a gap of inactivity, so visits of 2 minutes and 3 hours are both one session. Fixed windows would cut visits at arbitrary clock boundaries.

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