What item have you been using on a daily basis for the longest amount of time?
Sometimes I will use something and realize I've owned it forever. It's a nice change in our throwaway reality. I think my personal record is a bicycle multi-tool I got for one of my first bikes, ~25 years ago. Still have it, still use it. When it comes to electronic devices I have a Panasonic mini Hi-Fi from ~2005. Never felt like changing it.
a stainless steel, vacuum sealed French press (coffee plunger), which I bought back in... 2011? i think? when I broke my glass one a week after getting it.
I got my Frieling stainless press in 2013 and it still rocks. I've replaced the screen twice now. However I don't use it daily since I moved in 2020, I use it on weekends mostly now.