Do you mean 2 hours or 20 minutes?
Not sure I would want to meet a woman who could survive two hours of aeros at one sitting!
The simple answer is if you want to stay with her/her to stay with you and you be allowed to keep flying don't put her off and don't show off. Nice gentle turns and smooth flying are likely to impress far more that throwing her around the sky unless she is thoroughly used to light aircraft.
Destination can be a winner. Le Mans was about two hours from Biggin last time I went there but that involved crossing the channel the long way and that in itself can make your pax nervous. Never done Biggin Le touqet but it can't be far.
Rheims Prunay is a good destination. About 2 hrs flight, short sea crossing, close to town and the obvious delights of Champagne country.