 Mozart biographer Maynard Solomon (1995) takes the view that the tours were lucrative and produced long-term profits for Leopold; Ruth Halliwell (1998) states to the contrary that their income generally only covered their travel and living expenses.Since the instruction took much of his time, and the touring kept him away from Salzburg for long periods, Mozart cut down his activities in other areas.Nannerl later claimed that he "entirely gave up both violin instruction and composition in order to direct that time not claimed in service to the prince to the education of his two children".