Certain types of products (mostly condoms, but some others) do not have a "category" in our admin system and, because of this, do not auto publish. The review editorial team has to approve them and assign them a category just like assigned reviews. Unfortunately, they're also not the highest priority for the review team so they sometimes take a few days.
Rule of thumb is that if it takes more than three weeks, you should email Gary.
Rarely do reviews take three weeks anymore - though years ago, they took that and longer, some times - but they absolutely can take more than 24 hours.
Just as a quick fyi, a search for "review not published" brought up quite a few other threads with this same topic, same answer. My suggestion is to try a search before starting a thread. You'll often find a lot of folks have had the same question.