You can take a bus from Skopje to Zlatibor via Niš and Kruševac in around 9 h 9 min.
How to get from Skopje to Zlatibor
From Skopje bus to Niš, bus to Kruševac, then bus to Zlatibor. 9 h 9 min. From Skopje bus to Užice then bus to Zlatibor. 9 h 48 min RSD 2694. From Skopje Zob bus to Mojkovac then bus to Zlatibor. 13 h 15 min RSD 3827. From Skopje drive to Zlatibor. 5 h RSD 4216.