I have long hair. - If you mean that all your hair is long
I have a long hair - If you mean that just one of your hairs is (unusually) long, longer than all of the others (which would be an odd situation, but not inconceivable)
Yes, "by" is used to mean, no later than 8. They might arrive a bit earlier. from: https://hinative.com/en-US/questions/15405462
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