I think Seneca addresses this well in 'On the Shortness of Life'[0][1].
Essentially we are very wise with our money -- we don't just give it away freely, because it is of value to us. We aren't as wise with our time -- we give it to anyone that asks. If you're frugal with your time -- no longer giving your time to others except when you want to, your life suddenly becomes longer and more effectively used.
Of course there are a few missing puzzle pieces like what is worth spending time on, how do you motivate yourself to fill this time, etc.
Essentially we are very wise with our money -- we don't just give it away freely, because it is of value to us. We aren't as wise with our time -- we give it to anyone that asks. If you're frugal with your time -- no longer giving your time to others except when you want to, your life suddenly becomes longer and more effectively used.
Of course there are a few missing puzzle pieces like what is worth spending time on, how do you motivate yourself to fill this time, etc.
[0]: This is what I read: https://smile.amazon.com/Shortness-Life-Penguin-Great-Ideas/...
[1]: Free online: https://www.forumromanum.org/literature/seneca_younger/brev_...