Shengen visa stay duration

My parents recently got visa for 73 days with 1 entry from German Embassy. We were planning to spend time in Germany (1 month), France, Austria, Hungary and Poland (3 weeks). Now plans have changed. They will be stay around 1 month in Europe, 2 weeks in Germany, 1 week in France and Austria and 1,5 week in Poland. Do you think change of plans will not affect their future visa applications as when applying we stated that they will spend 2 month in Europe.