Are there some you do?
One could argue that if the memory is accessed ever again, you are reusing that minute. If the memory will never marginally add to your lived experience, it could be viewed as unredeemable and time you don't get to leverage in the future, and thus is time wasted/time lost.
> If the memory will never marginally add to your lived experience, it could be viewed as unredeemable
There is also the aspect of reinforcing existing memories which is easy to miss with this criteria. In the sense that any single given experience won't significantly alter your life, but if you remove all of them, suddenly a change happens.
I for once had my gears grinding trying to recall my patterns and predict moves of the "AI". Especially past round 20.