Welcome to the daily halacha (Jewish law). Hacham Ovadia Yosef writes that on the first night of Sukkot, there is a very important halacha to keep in mind. On the first night of Sukkot, a person should make sure to have at least one kezayit worth of challah—of bread—inside the sukkah (temporary booth). That one kezayit of bread, which is like 30 grams worth, or a little more, of challah, should be eaten within three and a half minutes or less. It should not be eaten with any dips—not with techina (sesame paste), not with hummus (chickpea spread), or anything else. Just have the actual taste of bread, with nothing else, within three and a half minutes or less on the first night of Sukkot.
Hacham Ovadia Yosef goes on to say that we are machmir, we are more stringent, and we have more than just a kezayit, more than just 30 grams. We actually have a kebeitzah, which is 60 grams worth of bread or more. Especially on the first night of Sukkot, one should have a kebeitzah, should be machmir, should be stringent, and have 60 grams worth of bread within three and a half minutes. Or bediavad (after the fact), says Hacham Ovadia Yosef, if you had it within kedei achilat pras, which is seven and a half minutes, you'd still say you did the mitzvah (commandment) properly.
So halacha lema'aseh (in practice), a person should have a kebeitzah worth of challah on the first night of Sukkot, which is around 60 grams of challah, within three and a half or four minutes. If you can't do it within that time range, the maximum time you have is seven and a half minutes or less. That bread should be eaten alone, without any dips, because we want to taste the actual taste of bread.
Think about how Hashem put us in the ananei kavod, in the clouds, inside the midbar (wilderness). A person should have that in mind when he eats the challah, because that's how you mekayem (fulfill) the mitzvah of sukkah. When you're thinking in your mind, “Why am I sitting in the sukkah? I'm sitting in the sukkah because Hashem, when he took us out of Mitzrayim, in the midbar, he put us in the ananei kavod. He put us inside the clouds that were surrounding us from all directions, and Hashem protected us from different scorpions and snakes and different enemies around us, and the Shechinah (Divine Presence) was with us.” That's what a person should have in mind while he's eating the challah on the first night of Sukkot.
If one forgets to say Ya'aleh VeYavo in Birkat Hamazon on the first night of Sukkot, they must repeat Birkat Hamazon. This is for men. Regarding women, even if they forget Ya'aleh VeYavo on the first night of Sukkot, they still don't repeat Birkat Hamazon. Men, however, if you forget Ya'aleh VeYavo, you have to repeat Birkat Hamazon.