Probably about 1.5 hrs for 4 cone parts slicing at 0.12 resolution (high quality) so that's the base/top ring/middle ring/bottom ring. Half that time for 0.2 resolution slice (standard quality).
However that's not how I print the cones, I tend to do 16 of one part at a time (sometimes 32), and just leave it running, requires minimal interaction with printer and just shove them in parts bin ;-)
Some of the new printers on market under £500 mark will print significantly faster, the tech is moving so fast...
Most of the slot car stuff above is available free on thingiverse, they are mostly not my designs. ;-)
Stuff I've done is here (had over 1200 downloads):
https://www.thingiverse.com/portals999/designs
I'm no 3D designer but get by using Tinkercad, you can do some quite cool stuff. This device is for painting track limit/colouring lanes lines on 1:32/1:24/routed/etc slot car tracks but is adjustable depending on what your track is.
It blew me away when I found out I could print screws and embed threads accurately in PLA that work reliably....this is an original design from scratch