I'd say that this is pretty clearly meant to mean a literal 24-hour day of rest. From Exodus 20:
8 “Remember the Sabbath day by keeping it holy. 9 Six days you shall labor and do all your work, 10 but the seventh day is a sabbath to the Lord your God. On it you shall not do any work, neither you, nor your son or daughter, nor your male or female servant, nor your animals, nor any foreigner residing in your towns. 11 For in six days the Lord made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy.
Combine that with the fact that the week is seven days, one being the Sabbath, and we can safely say that the Hebrews understood that as a 24-hour period. And why wouldn't they? They were unaware that the six days of creation were myth, so they believed they were all literal days. It's only in modernity that people have cause to change the meaning of those words.
I thought that Jehovah's Witnesses were all young earth creationists, which made me question why you didn't like the literal understanding of the days of creation and rest, but I checked and found this at
https://www.jw.org/en/jehovahs-witnesses/faq/creationism-belief/
Do Jehovah’s Witnesses Believe in Creationism?
No. Jehovah’s Witnesses do believe that God created everything. But we do not agree with creationism. Why not? Because a number of creationist ideas actually conflict with the Bible. Consider the following two examples:
- Length of the six days of creation. Some creationists assert that the six days of creation were literal 24-hour days. But the word “day” in the Bible can refer to a considerable length of time.—Genesis 2:4; Psalm 90:4.
- Age of the earth. Some creationists teach that the earth is just a few thousand years old. However, according to the Bible, the earth and the universe existed before the six days of creation. (Genesis 1:1) For that reason, Jehovah’s Witnesses have no objection to credible scientific research that indicates the earth may be billions of years old.
Although Jehovah’s Witnesses believe in creation, we are not antiscience. We believe that true science and the Bible are compatible.
Here's a few paragraphs I left on another thread in response to "There’s several theories about how religion first started" containing my proposed explanation and what I think is the likely reason that there is a Sabbath as well as why it was intended to be understood and observed as a literal day:
I think it's pretty obvious how religions came to exist. Once you add reasoning and language to any mammal, you'll get magical thinking and efforts to explain and control circumstances by appealing to unseen agents. This begins with nomadic peoples and is a bottom-up phenomenon with a simple hierarchy headed only by a shaman, who was also a hunter. Once we have civilization and large cities, we get organized religion and priests as specialists who don't do other work or support themselves. Instead, there is a large central meeting place where people come regularly to listen to and support the priesthood.
You can tell about when this happened with the Jews - whenever the Sabbath was invented. Think about it. In nomadic days, every able-bodied person worked every day, and it was no doubt a "sin" to be lazy or fake illness. But then life changed with the advent of civilization and cities, and people needed to travel to a central temple and spend hours there on a regular basis, and suddenly, it became a "sin" not to take a day off from work and bring the family to the temple. This became institutionalized two ways. The Commandment to not work on the sabbath was added to others, and the creation myth was modified to include a timeline and a new unit of time, the week for the six days of creation and one of rest. If God rested one day in seven, you need to as well.
And think about the week. Compare it to the other units of time - the day, the month, and the year. These are all natural and correspond to the motions of the moon around the earth and the earth around its axis and around the sun. If monthly visits to the temple were too infrequent and daily visits too frequent, a new unit was needed, and so, we have the invention of the work week and the weekend.
This is the top-down aspect of religion, when it becomes organized, centralized, and an extensive, authoritarian hierarchy
I understand that it is acceptable among believers to simply make proclamation like that one, but it's unjustified. It's a preferred understanding. One can just as well proclaim it literal and be on at least as good a footing.
You've probably noticed that few or no unbelievers make claims like that about scripture, because they have no reason not to take the words at face value.
Yes, but that doesn't justify calling words symbolic when the symbolism isn't clear. If you do, then anyone can including me. I pronounce the god of the Old Testament a symbol for human potential, and the resurrection a symbol for the Renaissance and the resurrection of Greco-Roman culture in the West. I would call that unjustified, but hey, justification isn't part of this process. One simply declares whatever he doesn't want to be taken literally symbolic for something that he prefers it to mean.
But I don't need to do that, so I assume that the writers of those word meant what they wrote.