One entry on this page, and it is the size of four. A city that has never quite forgiven Paris, and collects accordingly.
Not a Tuesday. And do not try to add a second museum.
Two hours is the minimum and it is not enough; three if it rains, and it usually does. The building was a convent before it was a museum and the plan still behaves like one — you will lose twenty minutes to the cloister without noticing, and you should let yourself.
Go up first. The upper painting galleries are where the collection stops being provincial and starts being a rebuke, and they are the rooms most people reach when they are already tired.
One entry does not mean one afternoon. Do not stack anything else on this day; walk out along the Rhône afterwards instead and let the thing settle.