When setting up an experiment, it would be great to have an understanding of how long the experiment would need to run given the existing traffic to the point of conversion. Many folks use other systems (Mixpanel, Google Analytics, Omniture) to calculate their traffic to pages/screens and clicks/taps on buttons, etc.
Since these two systems are naturally separate, one is required to calculate this duration separately and manually.
It would be great if instead when setting up an experiment and goals, we enter the page the experiment will run on, and while setting up a goal, it could tell us how much traffic that button click, etc. gets and how long the experiment would need to run for in order to be statistically significant.
That would give us a much better sense of whether an experiment is going to be worth it or not. If we are able to see that an experiment is going to take 2 months to reach significance, I might spend more time on another experiment where I'd be able to learn the outcome more quickly.