How long after the death of a president is the flag flown at 1/2 staff, we think for 30 days . Does anyone know?

[NAVA1974]

The periods of mournign for various situtations are spelled out in the flag code. It states:

By order of the
President, the flag shall be flown at half-staff upon the death of
principal figures of the United States Government and the Governor of a
State, territory, or possession, as a mark of respect to their memory.
In the event of the death of other officials or foreign dignitaries, the
flag is to be displayed at half-staff according to Presidential
instructions or orders, or in accordance with recognized customs or
practices not inconsistent with law. In the event of the death of a
present or former official of the government of any State, territory, or
possession of the United States, the Governor of that State, territory,
or possession may proclaim that the National flag shall be flown at
half-staff. The flag shall be flown at half-staff 30 days from the death
of the President or a former President; 10 days from the day of death of
the Vice President, the Chief Justice or a retired Chief Justice of the
United States, or the Speaker of the House of Representatives; from the
day of death until interment of an Associate Justice of the Supreme
Court, a Secretary of an executive or military department, a former Vice
President, or the Governor of a State, territory, or possession; and on
the day of death and the following day for a Member of Congress. The
flag shall be flown at half-staff on Peace Officers Memorial Day, unless
that day is also Armed Forces Day. As used in this subsection--