As a rough guideline, you should allow yourself at least 2-3 hours to see the museum's highlights and get a sense of its collections. If you’re an art lover or enthusiast, you may want to budget more time  Keep in mind that the Musée d'Orsay can get quite busy, especially during peak tourist season, and queues for admission and security checks can be long. So, it's a good idea to arrive early in the day or consider purchasing skip-the-line tickets in advance to save time.