Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_31 (length_of_game VARCHAR, home_team VARCHAR)

### Question ###
How long did the game go that was played with the Houston Oilers at home?

### Accurate SQL ###

SELECT length_of_game FROM table_name_31 WHERE home_team = "houston oilers"