BEagle,
Not sure what you mean? If you are worried about the instructor being too tired to teach, remember the weather allows flying just about every day of the year with very little down time.
I have always found it more fatiguing sitting around waiting for the weather to improve then working for the same amount of time. An instructor that is teaching the students full time with full schedules makes the instructor sharper and better qualified due to the rules of recency and repetition.
Take Care,
Richard