Scheduled and unscheduled work shifts, meetings, and training sessions all qualify as “work” for purposes of state/province minimum hours and reporting pay laws.
Yes, but only in states/provinces where an exception does not apply to exclude shifts/meetings/trainings of shorter duration. In states/provinces where an exception does not apply, employees should be paid for the minimum number of hours required in your state/province, not just the 1 hour that they spent at the meeting. A best practice is to either (1) schedule meetings on a day when all or most of your employees are scheduled to work later in the day; or (2) keep the employee at work for at least the minimum amount of time that the law requires.
No. The additional hours do not count towards overtime pay as they are not actual “hours worked” by the employee.
No. Employees who voluntarily leave their scheduled shift early for personal reasons need only be paid the number of hours that they actually work.

Click here for FAQs regarding minimum hours and reporting pay rules for California, Connecticut, Massachusetts, New Hampshire, New Jersey, Rhode Island, New York, and Washington D.C.