Not addressed to the student.
Three hours is the declared figure and it is a ceiling, not a target. If the student is done at two hours and ten minutes, stop. A tired student flying badly at the end of a long lesson gives you worse assessment information than a fresh student who flew for less time, and the endorsement decision is the whole point of the day.
Separate the assessment from the teaching, out loud. Tell the student when you have stopped instructing and started watching. Assessment conducted silently inside what feels like a lesson is the secret standard problem this program is built against.
Do not let the endorsement drive the flying. If the student starts accepting landings to finish today, name it immediately. It is the most common failure mode of this lesson and it is dangerous, because the habit outlives the day.
Set personal minimums with the student rather than for them, then write them down in front of them. A number the student proposed and defended is a number they will hold. A number you assigned is a number they will quietly revise the first time it is inconvenient.
The 10 knot solo crosswind limit and the 5 hour passenger restriction are North Aero limits and are not negotiable at the airplane. They are separate from the personal minimums conversation and should be stated as such, so the student does not experience them as a comment on their flying.
Complete the Checkout paperwork the same day, even though it is the same session and feels redundant. The two records answer different questions and the student may one day fly a different tailwheel airplane on the strength of one and not the other.
If the endorsement is not issued, say why in terms of the element view, not in terms of the day. "Crosswind landing is NEEDS WORK, here is what I need to see" is actionable. "Not quite there yet" is not, and it is the sentence students remember badly.