# To what extent can I deviate from the endorsement guidance given in AC 61-65?

Specific case: I have a student who is ready for his ride, but he has not yet scheduled it, and because I'm moving, I will be permanently unavailable to endorse it in a few days. I want to add a stipulation to his endorsement that says the endorsement is valid only until a certain date, and it's only valid if he has had some number of hours of flight training within the preceding $x$ days.

Neither of these items are mentioned in AC 61-65.

General case: How much can I legally deviate from the guidance for checkride endorsements given in AC 61-65?