According to Official Guinness Records,
The most holes of golf played in seven days (cart) was 2,000 by Geno Bonnalie (USA) at Lewiston Country Club in Lewiston, Idaho, USA, from 27 June to 3 July 2011.
Geno averaged 71.802 per round on a par 72 course with a round low for the week was 64 which included 9 birdies and eagles.
For a complete list of 2011 records, please visit 2011 Guinness Records in United States.