How long have the ghostbloods been active on Roshar?

[DoctaDajman]

Pretty straight forward. Do we know much about the ghostblood activity on Roshar such as how long they have been there? 

[JustQuestin2004 he/him]

Not in the slightest, though most likely well over a decade.

They were around for years before Gavilar's death, and around to pressure the Davar's before Shallan killed her mom.

But that's about all we know for sure.

[Quantus he/him]

2 hours ago, JustQuestin2004 said:

Not in the slightest, though most likely well over a decade.

They were around for years before Gavilar's death, and around to pressure the Davar's before Shallan killed her mom.

But that's about all we know for sure.

More than a decade, less than 300-ish years that is the earliest they could have been founded at all.