The holiday lasts seven days in Israel   and eight outside of Israel.   On the first day and second days work is forbidden (just the first day in Israel).

The following six days called Chol Hamoed, which are are considered by halakha to be more than regular weekdays but less than festival days.   This means preparations for the holidays are permitted but other work is not.
All meals are eaten in sukkah's or booths covered with palm leaves or other plant material.  Males of the family sleep in the sukkah.

The seventh day of Sukkot is known as Hoshana Rabbah,  or the Great Supplication.  It is marked by a special synagogue services with worshippers holding their Four Species and reciting scripture.

The festival is closed with another Shabbat-like two day holiday called Shemini Atzeret,  or the Eighth of Assembly. The second of the two days is called Simchat Torah.  Sukkot is also celebrated by a number of Christian denominations that observe holidays from the Old Testament.