Well i’m getting a MarkMont and i wanted to know how often should you change the string on it. 
My regular Project needs to be changed every few hours…
Ok why is everyone getting cool yoyos??? you and samad lol … but i dont know… a lot…
Just change it like any other yoyo. There is no string span on a yoyo, so just whenever u feel like it. Also…my metals are cooler then urs, lol.
Whenever you feel it is necassary.