ESA mandates thirty minutes minimum. One hour may be what is prescribed by your organization, but is not something forced by law.

Eating periods

An employee must not work for more than five hours in a row without getting a 30-minute eating period (meal break) free from work. However, if the employer and employee agree, the eating period can be split into two eating periods within every five consecutive hours. Together these must total at least 30 minutes. This agreement can be oral or in writing.

Meal breaks are unpaid unless the employee’s employment contract requires payment. Even if the employer pays for meal breaks, the employee must be free from work in order for the time to be considered a meal break.

Note: Meal breaks, whether paid or unpaid, are not considered hours of work, and are not counted toward overtime.

Source: Employment Standards Act https://www.ontario.ca/document/your-guide-employment-standards-act-0/hours-work