Personally I close tabs as soon as I'm done with them. If I need it for later it goes into sorted bookmark folders or in a list of bookmarks right in front of me if I'm gonna need it sooner. If I ever get over 15 tabs I'm deep in research mode, but those will all be closed by the end of the day.

Ever since SSDs I also shut down my computer when I'm not using it so maybe I'm weird.