Time scaling factor given by Eq. (13) as a function of the absolute magnitude and effective radius of a galaxy. The white point indicates our simulated galaxy. The white dashed line indicates where the scaling factor equals 1. The black dashed line denotes where the GC-mass scaling factor, the second factor in Eq. (12), equals 2.66, which is the value where an observed UDG with GCs following the standard GCLF mass function has to be compared to our simulations with the DF2-like GC mass function. Supposing that the galaxy has a GC system following the standard GC mass function, our results imply that the galaxies to the right of the black line and to the top the white line do not create a nuclear star cluster by inspiralling of GCs.