the 3 hour rule

I'm a full time worker. Are they allowed to give you 2-3 hour shifts?

I am not sure if this answers your question but I found this Ontario information here:

What happens if an employee comes in to work his or her shift, but is sent home after working less than three hours?

When an employee is required to report to work, but works less than three hours, he or she must be paid whichever of the following amounts is the highest:

• three hours at the minimum wage, or
• the employee's regular wage for the time worked.

For example, if an employee is paid $10.00 an hour and works only two hours, he or she is entitled to three hours at minimum wage (e.g., $7.15 x 3 = $21.45)-instead of two hours at his or her regular wage (10.00 x 2 = $20.00).

This is called the "three-hour rule."

The rule does not apply to:

• students (including students over 18 years of age)
• employees whose regular shift is three hours or less
• where the cause of the employee not being able to work at least three hours was beyond the employer's control.

Special rules may apply to certain industries. Please refer to the ESA (Employment Standards Act) and regulations.