There's a teaching in the Suttas where the Buddha gives lay disciples advice about what to do with money. He advises them after they have met their living expenses, to divide up any remaining money into four equal parts. Part one should be invested in something. Part two should be saved. Part three should be donated to a charity/noble cause. And the fourth part should be spent on oneself, so one can enjoy some of what they have earned.
I thought this was great advice. And I have adapted it to also work with time, by dividing my day's activities into four equal parts. For the first part I study my university degree. For the second part I do some painting. For the third part I work on my dhamma studies (Buddhist lay disciple training). And the fourth part I spend working on my website. This division of time seems to work well for me so far (-: And I wonder in what other ways this division by four may come in useful?