Depends on the change and effect size, also on product. Typically somewhere between 1 week and 1 quarter. Almost always there is a backtest after shipping in wh

Depends on the change and effect size, also on product. Typically somewhere between 1 week and 1 quarter. Almost always there is a backtest after shipping in which a small percent of users do not receive the change for 1-6 months (a "holdout")