Ryan Holiday on keeping the calendar clear:

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To the person who emailed me this morning with a perfectly nice request, I’m sorry to say the answer is no. You didn’t do anything wrong. You were perfectly respectful and within your rights to ask about arranging a time for a meeting (or was it for a phone call or about setting a date…

via To Everyone Who Asks For ‘Just A Little’ Of Your Time: Here’s What It Costs To Say Yes — Blog – RyanHoliday.net