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But the Mayan calendar was based upon a twenty-day cycle of eighteen months while all Old World calendars utilized a twenty-eight day cycle involving twelve months . ( Yanoshek , 2001 [ b ] ) In a twenty-eight page report issued in April , the school board reported concerns about a curriculum that included inappropriate lessons for some grade levels , inadequate computer systems , and mishandled payments to vendors ( Yanoshek , 2001 [ a ] ) . We believe that Patients should stay here for as long a term as they need , not something as specific as a twenty-eight day Program . Chuck 's acclaimed engineering career which has spanned a twenty-eight year period has allowed him to work with many of the world 's finest artists , musicians and producers and develop a diverse list of clients that ranges from George Strait to Dire Straits . Given , as I mentioned that my Father spoke here four times over a twenty-eight year period , I thought it might be interesting to cast tonight 's discussion in the context of what Canada might look like when I deliver my fourth address to Couchiching twenty-eight years from now . The author reveals the secrets to speeding up the educational process by earning her own bachelor 's degree in one year , after a twenty-eight year hiatus .