It occurred to me that it would actually be useful to be able to sort my history not only using a time interval, but also by how long I was actively reading a page. I tend to go through a lot of webpages when researching something (so the history becomes bloated), quickly scanning and dismissing irrelevant pages and really reading the relevant stuff. Therefore, I tend to spend more time on the relevant pages.
If I could sort the history according to how long I have looked at a page, the more relevant results will automatically be on top 