Learning phase
Definition
The period after a campaign launches, or after a significant edit, in which the platform’s delivery system is still working out who should see the ads. Results produced inside the window are unstable by design.
How it works
At launch the delivery system knows nothing about who converts, so it spends part of the budget exploring. The phase ends once the campaign has accumulated enough conversions for the system to optimize against; the threshold is the platform’s own, published in its help pages and revised there. Any edit the platform classes as significant sends the campaign back to the start, and the same help pages list which edits count, from budget moves above a certain size to swapped creative. That is the expensive part: a campaign that receives a meaningful edit every week spends its whole life calibrating and never banks what it paid to learn.
What to watch for
Open the change history before judging any campaign. Edits every few days mean the results on screen were all produced during calibration, and a verdict on them is a verdict on noise. Watch for decisions made inside the window: a new campaign paused in its first days over early cost, or compared against a mature one in the same report. The account also marks campaigns whose conversions arrive too slowly to complete the phase at all; the structural fixes are consolidating budgets so conversions pool in fewer places, or optimizing toward an event that fires more often.
The question you ask
“When was this campaign last meaningfully edited, and how much of its life has it spent in learning?”