flight time san franshico to Paris

flight from SFO to Paris was about 10 hours nonstop or a bit more. Coming back was a little over 11 hours.
I flew on a direct flight from Vancouver (Canada) to Frankfurt, and it took ten hours. I would expect that your flight to France would be a little bit longer than that
Remember published flight times are "padded" to adsorb delays and just in case of bad head winds. They're the longest *possible* flight times.
If you leave CA at 11pm, you'll get to Paris 9am the next day
Most SFO/CDG flights leave in the afternoon, arriving in Paris in the morning