When I created 35 second video clip for an introduction to a video series, I can only see in realtime only 7-8 seconds of clip..... and when I save the full video clip along with my animation the whole video clip does not get saved. What am I missing???
equipment is: iMac with IOS OS X El Capitan; Adobe After Effects CC 2015
RAM previews/ cached previews have a limited duration based on the available amount of memory. This is a fundamental thing in how AE works if tha native accelerated preview cannot handle things. Read the help on that stuff. the rest is unclear. You do not "save" clips in AE, you render them via the render queue, so without knowing your exact procedures and settings we cannot tell you what may be wrong.