Basic heart rhythm disorders. The class is from 8 a.m. to 3 p.m. on the first two days of class and meets from 8 a.m. to 12 p.m. on the third day. Basic heart rhythm disorders. The class is from 8 a.m. to 3 p.m. on the first two days of class and meets from 8 a.m. to 12 p.m. on the third day.