From the title this may seem like a "how long is a piece of string" type of question, but it's not.
This goes out to members who have significant experience in building PBNs and ranking stuff with them.
Suppose you have a 30 website PBN, built on expired domains (not auction), all with dof0llow RD 30+, decent link profiles, clean history. The PBN is all live and indexed, just waiting to link out.
You can use it to rank one relatively small MS and those PBN links are the only links you can…