DAYS_PER_WEEK = "business.hours.per.week" in BusinessCalendarImpl.java

https://github.com/kiegroup/jbpm/blob/5efa07066deda6f9a3f26256065150a2a56f1482/jbpm-flow/src/main/java/org/jbpm/process/core/timer/BusinessCalendarImpl.java#L42

public static final String DAYS_PER_WEEK = "business.hours.per.week";

It shouldn't be called "business.hours.per.week" when its actual meaning is days.
Default is 5, so it is days not hours.