Others have mentioned this already but there are plenty of regulations that are relevant just for hospitals because of what they are. For example, the bulk of the historic LA county hospital is vacant, because the building is no longer up to the seismic standards required by the state for a hospital. When you have a big earthquake, you probably want the hospital to be the very last building to fall in the city. The building, however, is used for things like offices or storage because these uses don't have the same standards as a hospital.
It is very difficult to compare different (complex) projects (independently from whether they are public or private) because - Captain Obvious speaking now - they are different (not only the actual thing that is built, also the quality of the project and its engineering, the chosen contractor and a lot of other factors come into play, your new examples add two completely different countries and two completely different periods of construction).
Construction times are even trickier, as they may also be influenced by other factors (authorizations/approvals or changing norms as an example).
A (typical) appropriate construction time for a (large/complex) project is around 4-5-6 years, 3 years means they were fast (in Chicago , in the '70's) 10 years means they were slow (in Slovenia, in more recent years), but otherwise there is no way to make senceful comparisons.
Sears tower was built in three years, while our neurologic clinic [1] with three floors took more than a decade.
Say what you will, but sears tower is a complex project.
[1] https://goo.gl/maps/KLwDmGnk9PrcVLyr5