Here are the measurements. I've just took my dusty old notebook (Pentium B960 2.4 ghz, 2Gb, not patched), and copied exact setup there. Build runs for less than 8 sec there (top of image).
My current desktop (i7 6700K, 4GHz, 16G, patched) builds this project for about 38 seconds (bottom of image).
(I've removed previous post because I've noticed desktop test was run with 3.0.0, but unfortunatelly, being fixed to 3.1.1 it didn't run better, so, posting again image with three screens)