The most important and valuable resource in the world is time. It is limited and non-refundable. You can never take back the time you lost. Time spent productively is valuable. Every second, every minute, every hour dedicated to something that could improve your status whether that is physically, mentally or financially... expect something good to come out of something you made time for. You have to choose wisely where to spend your time because making this choice, you will be trading an opportunity for another. If you decided to spend this time lounging around instead of dedicating your time to improving yourself then you are losing the chance to be a better version of yourself.
Time spent on a specific work will or should result in a good or decent amount of money in exchange.
Time is somewhat similar to bitcoin, namely, that it has a limited amount (within the life span of an individual). And here you are right that it is necessary to manage this time rationally (just like bitcoin, the demand for which is constantly growing, but the total amount remains unchanged).
In essence, no matter what we do, it all comes down to the fact that we try to "sell" this time as expensively as possible. Any education, training, self-improvement, getting a higher position is aimed at subsequently converting this "time" into "money" with a higher rating, and "money" into material and other values.
At the beginning of life, "time" is cheap and in the process of "qualification growth" (in a particular specialty) this "time" begins to "become more expensive". This means that at different stages of your life you need to manage this time differently. That is, at some times it is more “profitable,” for example, to study, and at others – to earn money.