Why is conversion data less reliable in the first 24-48 hours of when impressions areserved?

Conversion data in the initial 24-48 hours is less reliable because real-time reporting often relies on estimations and preliminary data. Ad platforms process vast amounts of information, and it takes time for all conversion events to be fully attributed, de-duplicated, and reconciled across various systems. This means the numbers you see early on are subject to change as the data pipeline completes its processing and finalizes the reporting. The other options are incorrect because data is gathered from the start of a campaign, and while user behavior can vary, the primary reason for data fluctuation in the very early stages is the processing delay, not inherent unpredictability of users.