Smart Bidding learning doc rewritten to say Learning status never lasts more than 7 days

Google rewrote the help document formerly titled "Duration of the learning period for campaigns and what affects it" as "About Smart Bidding learning" and added an FAQ. The document now states that the Learning status never lasts more than 7 days, and separates the visible status from the time performance takes to stabilise.

Three things put a bid strategy into Learning status: the strategy was recently created or reactivated, campaigns, ad groups or keywords were added to or removed from it, or the conversion goals or actions being optimised changed significantly. Changes to budgets, targets, creatives or targeting settings such as location, audience or language do not remove historical data or trigger Learning. The best practices listed are to optimise to a single primary account default goal using a tag or frequent consistent offline uploads, keep daily budgets high enough that budget does not cap optimisation, consolidate ad groups and campaigns to pool conversion data, and avoid multiple target changes inside one conversion cycle without a clear business need.