Karlen started painting the walls at 10: 45 am, and he said that he could complete the job at 5: 25 pm. his father said that five eighths of that time was enough to paint the walls. however, when karlen finished the job, they noticed that it actually took him 80% of an hour longer than the time predicted by the father. how much longer did karlen predict it would take than the time it actually took him to complete the job (what part of an hour)?