after affect delay layer animation I am new to AE and I am trying to edit a Photo Album template ( its a video of a photo/videos album flipping pages ). 
I managed most of my requirements, but failed to make some of the transitions longer. ( I need the page to delay the turn because the videos are longer than the current duration ). Thanks
In the composition where you drag and arrange individual pages. Pick the layer of the page you want to make longer, then click and drag that layer in the timeline to the desired length.