<prompt> Translate the following text to EnglishIngawa mifano mbalimbali kwa ajili ya kuunda nafasi kama hiyo inaweza kutumika, chaguo moja itakuwa kuwa na COO ambaye ni kuteuliwa, chini ya Seneti uthibitisho, kwa muhula wa miaka mitano hadi saba kwa ujumla kuchukuliwa kuwa muda wa chini zinahitajika kwa ajili ya mipango kubwa ya mabadiliko ya kutoa matokeo ya maana na kudumu.  <response>: While various models for structuring such a position could be used, one option would be to have a COO who is appointed, subject to Senate confirmation, to a term of 5 to 7 years generally considered to be the minimum time needed for major change initiatives to provide meaningful and sustainable results. 