I recommend one of those sand timers.

First of all: Thanks, that's the exact extension I was looking for! It's great to start and stop automatically, without manually clicking a start/stop timer (because I often forgot this).

I suggest to implement an overview (or history) for tracked projects and their times. It would be great to have an icon in the VSC sidebar (where files icon, search icon etc. are placed). On clicking the icon a new tab or window should be opened to show a history of tracked times and related projects. A great design (at least for me) would be a collapsable list for each project, like todo lists often have, but I don't know how you could implement this in VSC. Storing it in a json file. Or Markdown. Alternatively it could be synced, for example, with a Google sheet.

opening "Tracked projects overview" tab taking a lot of time. It was working the first few time I was using it but stop using after some time. opened a lot of other projects since then. so that could be the reason.