According to Official Guinness Records,
The most holes of golf played in a year is 14,625 by Chris Adam (Canada) all at the King Kamehameha Golf Club in Wailuku, Hawaii, USA, from 1 January to 31 December 2012.
Chris played 809 full rounds and seven half rounds over the course of the year, for a total of 14,625 holes played.
For a complete list of 2012 records, please visit 2012 Guinness Records in United States.