There is this weird catch 22 where I always hear this book or that book or this or that article is a "must read" for a startup founder. But on the flip side, I also have no time to read it.
I can understand if the argument is that it's so far down the list of priorities that by the time you get to it you'd rather just go to sleep. I get that. But don't say you're too busy to do it, say it isn't enough of a priority.
But, as someone who sometimes reads the types of books recommended on this blog post, I've found they have usually been a worse use of my time than writing code.
So, "I don't have time for ___" could be rephrased as "there are better uses of my time than ___." And I think that's a reasonable point of view in this case.