Originally Posted by yyzprincess

In 2 day can be done if one wants to Zip through.
The Louvre, D'Orsay, Centre Pompidou, Arc de Triomphe, Notre Dame. Cabbing it I would presume.As a a regular visitor to Paris, I am sure you are knowledgable about the time involved just going in & out of the Metro stations.
I chuckle when I see individuals in Louvre trying to run from Mona Lisa to The Winged Victory to Michaelangelo's Slave.

Sample Itinerary.
Friday: Land at 7:00AM. Cab to the hotel afterall you want to get the most of your 30 Euro Museum Pass.
9:00AM: Arrive at the Hotel. Room ready. Quick Check-in. Up to the room. Shower and change.
10:00AM: Metro to Louvre. Must see. Mona Lisa ,next Winged Victory,Next Greek Etruscan and Roman Antiquities to seeThe Venus de Milo.Quick run through Paintings. Delacroix :Liberty Leading the People ,David's:The coronation of Emperor Napoléon and Empress Josephine.
1:00PM: On to the Metro. Notre Dame. Run through. Quick jog up the towers.
3:00PM: Lunch maybe.
By 5:00PM flatout.

Saturday: Up crack of dawn. Breakfast by 8:00AM. On the road by 8:30AM. First stop Arc de Triomphe .Walk around. Go up. Take photo.
10:00AM: Off to Centre Pompidou. Walk about to see the architecture. The colored pipes. Quick read of the history. Off to see works by Max Ernst, ManRay,Kandinsky,Klee. Of course quick glance only.
11:00AM: Musee D'Orsay. Out by 1:00PM.Again quick run through all the floors.
Off to the Eiffel Tour.Out by 3:00PM.
By 5:00PM flatout.

To appreciate Paris is to stroll through the neighbourhoods.Stop at a cafe. Pickup a crepe from one of the windowed stops in St.Germain de Pres.
Do a Museum in the morning. Leave the afternoon for strolling for sights & smells of Paris. That is a truly a Paris Experience.
Not running from museum to museum monument to monument.