^ Typically in a reinforced concrete building, transfer floors take a long time. This is due to 1. Reconfiguration of the floor plates, and 2. Extensive and special construction that goes into the transfer floor itself.
Most all of the buildings you see U/C have flying formwork, which means that for typical floors that are repeated one after the next, the team has skillfully crafted the forms to allow rapid construction. The formwork is lifted in pieces to the next floor, shoring is installed, utilities and rebar are put in place, and the concrete is poured. Since transfer floors usually are indicative of a switch in the floor configuration, the process of reworking these forms can take time. You might say that one could average the time spent configuring the formwork into the floor-to-floor pour rate, since it is prep work that allows the floors to proceed at such an awesome pace thereafter. It's a kind of investment in smart planning.
Second, the deep beams and other highly engineered elements that comprise the transfer floor are cumbersome and complex. These usually are one-of-a-kind designs, and consequently, each one needs special attention. The sheer amount of work and materials that go into the floor is also greater.
Hope this helps and that I didn't say anything "postmodern" that might offend anyone.
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