you can adjust the window

even after the experiment has ended

you can even override them per experiment

Three options, probably in order or preference: • Use a very long conversion window. This will work well, but of course we need to scan the full metric source over the full window, so if you do this for 90days and the metric source is large, that query just gets bigger and bigger. • Do you suggestion. This will also work well, but it can be harder to interrogate where the data are actually coming from once it gets in the "cardboard box" • Use an ad-hoc/custom report and delete the end date of the experiment (this will change the window for all metrics if they don't have conversion windows) and give you long term effects for all your metrics.