I wouldn't endorse him...
Then he's stuck with only a few options
1. Pay - seems the cheapest/easiest for him and you
2. Pay a different instructor to give him the 3 hours of dual before he'll get signed off.
3. Wait to pay you and then you find out it's been less than 3 hours in 60 days so you've got to do more dual (more cash for you).
If he pays someone else, you take him to Judge Judy...
Good Luck
-mini
Then he's stuck with only a few options
1. Pay - seems the cheapest/easiest for him and you
2. Pay a different instructor to give him the 3 hours of dual before he'll get signed off.
3. Wait to pay you and then you find out it's been less than 3 hours in 60 days so you've got to do more dual (more cash for you).
If he pays someone else, you take him to Judge Judy...
Good Luck
-mini