If the employee can control the use of his time off, then the employer is not normally required to compensate the employee. If, on the other hand, the employee has no control (almost like being on "house arrest" as one person said), then the time is typically payable. This often comes down to how severely the employer restricts your time. If you cannot engage in meaningful personal activities because you must report within 15 minutes of being paged, then that would normally be too restrictive and the employer must pay at least minimum wage for the on-call time.
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