I want to know the answer to the following question:
How long was the interval between the visits from the United States Secretary of State officials ?
All the background I'm provided with is that "The impact of the post-election reforms has been observed in numerous areas, including ASEAN's approval of Myanmar's bid for the position of ASEAN chair in 2014; the visit by United States Secretary of State Hillary Clinton in December 2011 for the encouragement of further progress—it was the first visit by a Secretary of State in more than fifty years (Clinton met with the Burmese president and former military commander Thein Sein, as well as opposition leader Aung San Suu Kyi); and the participation of Aung San Suu Kyi's National League for Democracy (NLD) party in the 2012 by-elections, facilitated by the government's abolition of the laws that previously barred the NLD.". Is that enough to answer the question?
Answer: yes