One example of Copilot saving time - the other day I was trying to remember how to access a value from a map in Go. This doesn't take much time - alt tab to browser, ctrl + t for a new tab, type in "golang get value from map", click on a stackoverflow result, scroll down, glance at the result, alt tab back to IDE, and do it. With Copilot, Copilot knew what I was trying to do and suggested the right code to me and I accepted the suggestion by pressing tab.

But! I think the savings are even bigger because there is no context switch. If I have my browser open I might find myself going to hackernews, checking my email, looking at my stackoverflow notifications, browsing twitter - whatever. Copilot is not only faster, it keeps my focus on the code without giving me a chance to get distracted. In some sense, for this example, Copilot saved me 5-10 seconds by not needing to Google something. In another sense, it might have saved me an hour because I didn't decide to just check something on twitter while I had my browser open.