I think it depends on some circumstances… like age, expectations and you time management ways.
For example our family contains ages from 2 to 35 so we try to find museums in which each of us can find something interesting. And be aware that it’s very possible that we will need an extra trip to see all the museum or even to make more 3 visits until all of us are happy that we have seen everything we wanted
Managing when is the right time to go to the museum – when there is less people, between naps, etc. Managing when is the right time to go out! You must count that some energy must be left for the travel because you won”t want to stay overnight in the museum! So it is important to leave the space when the youngest family member still has energy to reach home without being on the limit of a “meltdown”.
First thing what we do when we enter the space it s to find a map (sometimes we check it on internet before leaving home) and decide what exactly we want to see, what are our priorities and what can be left “to see later”. Then we try to stick to that and that makes our visit much more smooth and relax.