Take charge of your time. If you don't someone else will! Time is your most precious asset. Time is the only asset distributed equally to everyone. And how you utilize the 24 hours defines you as an individual.
Not having a plan for the day, gives other people (or things) a chance to get in the way and control it for you.
Here's my mental model on valuing time:
Tasks are infinite, time is not.
Money grows, time doesn’t. The best thing you can do is reclaim time.
Example: If your time is worth $40/hr, an investment in a $400 Roomba will breakeven at 10 hours of cleaning. Assuming an average Roomba life of 3 years, it can easily save you over 200 hours!
Tasks require brainwidth (or mental energy), which is limited.
Example: If that 15 min call distracted you from getting back in the flow for another 30 mins... it really was a 45min call!