what are the stats on for what reasons and for how long the US flag has been flown at half mast ?

Answer 1

The flag, when flown at half-staff, should be first hoisted to the peak for an instant and then lowered to the half-staff position. The flag should be again raised to the peak before it is lowered for the day. On Memorial Day the flag should be displayed at half-staff until noon only, then raised to the top of the staff. 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

Answer 2

According to Wikipedia:

U.S. Code provides that the Flag of the United States is to be flown at half-staff in following circumstances:

* For thirty days after the death of a current or former President.
* For ten days after the death the current Vice-President, Chief Justice, or 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
* On the day of death and the following day for a Member of Congress- i.e. a Senator, a Representative, a Delegate, or the Resident Commissioner from Puerto Rico.
* On Memorial Day until noon
* Upon presidential proclamation, which have included: the remembrance of the 9/11 attacks, the death of Pope John Paul II, the Space Shuttle Columbia disaster in 2003, the victims of Hurricane Katrina, the Indian Ocean tsunami, and the death of Coretta Scott King


there's more info there if you need it:
http://en.wikipedia.org/wiki/Half-staff

Answer 3

Your question is hard to understand but here is the following:
30 days for presidents
10 days for vice Presidents
1 day or until sunset day of funeral for all others

Answer 4

You can check it out here....