In order for us to make sure that the printing time stays within the limits set by the requirements, we should have access to the STL model to test the prognosed time to print this object according to the used slicer.
Furthermore, we'd need information on the printer, specifically the print speed with using the hotend on the printer from the requirements.
As we do not have such information, we could only direct you to some hints to slice the model yourself. First, as the wall requirement is 2.0 mm, the most sensible way to minimize time is to cit on the amount of walls that need to be printed. You could set the extrusion width to 1.0 mm so that the wall is exactly 2 perimeters wide. Know that an extrusion width of 1.0 mm may be too much for your hotend to deliver, you need to find that out first. Based on this analysis, you could choose the layer height to fit the maximum flow capacity of the hotend, or the maximum of about 75 % of the extrusion width; this implies a layer height with a maximum of 0.7 mm.
Second, does the base of the lamp need to be a solid 3.0 mm? You could have Different infill in the same part to increase the rigidity or strength where it is needed.
Last, check that the retraction settings are correct (enough distance/length set to not retract), you may want to disable retraction, this uses much time.
With these tips you should be able to re-slice the model and assess the printing time.
