Final answer:
The question about the number of BTW practice hours to be done at night cannot be answered accurately without additional context or information on specific requirements.
Step-by-step explanation:
The information provided does not specify the exact number of hours of BTW (Behind the Wheel) practice that must be done at night. Any assumption regarding this would require additional context, such as state laws or specific program requirements related to driver education. The question about the number of BTW practice hours to be done at night cannot be answered accurately without additional context or information on specific requirements.
Normally, driving schools or state regulations will mandate a certain proportion of night-time driving experience to ensure that new drivers are prepared for different driving conditions. Therefore, without explicit guidance from the question, it is not possible to give an accurate answer to the question 'Of the 30 hours of BTW practice, how many must be done at night?'