Immediately
Paid traffic stops. Branded search often continues for a while — which makes the first week look better than it is.
Over weeks
Remarketing pools shrink, brand search declines, and the organic lift that paid traffic was feeding fades.
When you return
Bidding effectively relearns. Expect two to four unsettled weeks before performance resembles where you left off.
If you must pause
Leave a small brand campaign running and keep the structure intact. Restart before the season you care about, not during it.