But where do we keep track of time saved? What bank can you put it in?
Of course you can't. You can really only spend time - so you save time in the same sense that you save $2,000 when you buy a car. You save it by spending $30,000 or $40,000 or $50,000 instead of slightly more than that. Which is really just a smaller outflow than it is a true saving.
It would be great to have a system that told us how much time all our previous efforts have saved us on a current task. With money there can be a net accumulation of 'savings' (like the car example) into actual savings in a bank.
Time affords us no such option. The only way to keep track of such savings would be to create a record of such transactions and do the bookkeeping necessary to maintain that. Something like this:
By planning ahead and due to all my previous experience, I saved an 5 hours today.
It would be great if you could show how much time your efforts saved yourself and others. Would it be worth it to keep track of those things?
A quick Google search indicates that no such record keeping system exists.