My version of GrapeRank determines “convergence” without arbitrary iteration limits … by excluding “calculated” scorecards (whose scores have not changed beyond a “precision” threshold)  from future iterations.

https://github.com/Pretty-Good-Freedom-Tech/graperank-nodejs/blob/main/src/Calculator/index.ts#L255-L261

Number of iterations varies with “depth” of follows calculated (and other parameters) but usually converges around 10 or 20 . 

 that's a good approach