I often have a few tabs open for days on end waiting for me to get round to reading them, or because they are all relevant to a project that takes more than a few days (or both).
It would be useful, especially if I have to go back to an old project, to search in history, and then also filter by tabs that were kept open for more than an custom input number of hours. For example, more than 2 hours (to eliminate the opened and discarded ones) or more than 48 hours (to just find the well referenced ones).
Then I would be able to easily find the posts, tutorials or online manuals I was referencing without needing to remember when I opened the tabs, and more importantly, which 5 of the 40 or so pages I opened were the ones I actually spent time looking at.
Thanks!