When to change spark plugs 2005 Toyota sequoia?

The Toyota Schedule Maintenance Guides for the 2005 Sequoia (http://smg.toyotapartsandservice.com/guides.php?xv=17&xy=2005&xint_id=6&v=17&y=2005&int_id=24) give an interval of 120,000 miles (193,121 km) or 144 months.