Syntax option:

    WAIT n MINUTES FOR CLOSE

    Specifies the amount of time that Oracle Rdb waits before
    automatically closing a database. If anyone attaches during that
    wait time, the database is not closed.

    The default value for n is zero (0)  if the WAIT clause is
    not specified. The value for n can range from zero (0)  to
    35,791,394. However, Oracle Rdb does not recommend using large
    values.