12 hours is the default. You can also configure it for 24 hours, 7 days, or 30 days. I stick with the default of 12 hours because it pretty much matches my pre-

12 hours is the default. You can also configure it for 24 hours, 7 days, or 30 days. I stick with the default of 12 hours because it pretty much matches my pre-Arc tab pruning habits, just saves me the effort of doing it manually. Arc is great. Even in the middle of heavy research, I will periodically tidy up my unused tabs. I treat them as completely ephemeral. If I need to recall something, I'll bookmark it or find it in my history. I genuinely cannot understand people that have hundreds or thousands of tabs open. It seems bonkers to me; almost pathological, like digital hoarding. I would probably hate to see how they keep their filesystem or their home.