In march 1969 nixon ordered a secret bombing of cambodia. how long did this last and what were the results?

The secret bombing of Cambodia lasted 4 years. Most experts estimate that 100,000 Cambodians lost their lives, with an additional two million people becoming homeless.

Yes Nixon did. It did not end the problems of the Vietnam War. Finally, Nixon had to decide to get out of Cambodia and Vietnam.

How Long it lasted:  
The Cambodian Campaign (also known as Cambodian Incursion) was a series of military operations conducted in eastern Cambodia during the late spring and summer of 1970 by the armed forces of the United States (U.S.) and the Republic of Vietnam (South Vietnam) during the Vietnam War. A total of 13 major operations were conducted by the Army of the Republic of Vietnam (ARVN) between 29 April and 22 July and by U.S. forces between 1 May and 30 June. It lasted 4 years.

Results:
For President Nixon and his administration, instituting reasonable policies and tactics became a different endeavor in their attempt to quell the Vietnam War. The threat of Cambodian protests, North Vietnamese retaliations, unstable foreign diplomatic relations, and antiwar protests in America created tension for Nixon in his decision to secretly bomb Communist sanctuaries at the Cambodian border. While each of these constraints left President Nixon and his administration under extreme pressure, none of these risks transpired as relations between the United States and Cambodia continued to improve several years of war.

Sorry for making it long. I just want you to get a 100. Hope this helps :)