If you were to see my calendar, you'd probably notice a host of time slots greyed out but with no indication of what's going on. There is no problem with my Outlook or printer. The grey sections reflect "buffers," or time periods I've purposely kept clear of meetings.
In aggregate, I schedule between 90 minutes and two hours of these buffers every day (broken down into 30- to 90-minute blocks). It's a system I developed over the last several years in response to a schedule that was becoming so jammed with back-to-back meetings that I had little time left to process what was going on around me or just think.
At first, these buffers felt like indulgences. I could have been using the time to catch up on meetings I had pushed out or said "no" to. But over time I realized not only were these breaks important, they were absolutely necessary in order for me to do my job.