Time Line Extention

originally the time line amounted to 00:10:00 seconds as accurate to real time as possible. my project needed more time so i decided to change it by going to composition> composition settings and then changing the time line to 00:20:00 seconds. i gathered this will be long enough but it actually wasnt becuase of the use of effects and different images therefore i added an extra 10 seconds making it 00:30:00. i then shrunk the images life span on the time line making it shorter so i could fit more affects and movement before i ran out of time on the time line. below is examples of composition settings, the time line and the shrinking towards the images time line.