No answer, nevermind, max iterations is an algo parameter...
By the way, on jpsrit 1.6.2, to build a problem :
final VehicleRoutingProblem vrp = vrpBuilder.build();
final VehicleRoutingAlgorithmBuilder vraBuilder = new VehicleRoutingAlgorithmBuilder(vrp, xml_file);
On jsprit 1.7.0, VehicleRoutingAlgorithmBuilder doesn't exist anymore, did you remove xml configuration way? Now the appropriate way is to configure algo by coding?