max_refinement_steps:

Maximum number of iterative refinement steps per linear system solve. $\;$
Iterative refinement (on the full unsymmetric system) is performed for each right hand side. This option determines the maximum number of iterative refinement steps. The valid range for this integer option is $0 \le {\tt max\_refinement\_steps } < {\tt +inf}$ and its default value is $10$.