How Many Dx168 can i daisy chain?

I’m using the SQ 6 console so how many dx 168’s can i get daisy chain together for i/o. i know six can be done with the Dlive system

According to the Allen website, only 2 DX168 :
https://www.allen-heath.com/ahproducts/sq-6/

But you can use 3 with a DX Hub.