hi there i have installed/ moved power poles in an office a few times and its all really dependant on what is required in the pole its self, for example, socket o/lets, RJ45 olets, phone o/lets etc.
Then there is the matter of getting a fixing at the top of the pole, i have only dealt with false cealings (Tiles) and if i cant get a fixing at the very top of the pole i put a self tapping screw into the metal grid that supports the tiles and into the powerpole and this holds it perfectly.
so just for fitting the pole its self, i would have said an hour tops, then there would be the sockets etc on top of that, in saying that you could be lucky and fit it in 20 mins