I was house cleaning, doing yoga, and resting half of the day yesterday, even though I had blocked in my calendar to spend the whole afternoon reworking on my landing page for vsjo.xyz.
I felt bad when I was about to begin already in the middle of the afternoon, but turns out I didn't need that long of a time to complete it. The past me probably buffered in more time so the present me didn't have to panic and beat herself out if she didn't finish it by the afternoon. I completed it by dinner time and made a few more tweaks at night.
If you do time blocking, it's always good to block off more time than planned just in case anything happens. If you don't start on time, that's fine. But if you end on time, that's great! But even if you didn't finish on time, it's not the end of the world. Move on and work on your next task. Try not to get too caught up with the things that passed. Reflect and adjust for the next time.