Module3- 2D and 3D Digital - Preview render

so when i played back my video in maya preview it seemed longet than 10 seconds but after i rendered it Windows movie maker made it slower so i put a few speed eefects on it to get it as close to real time as possible but i think it may be too short so i am thinking of extending it so that instead of just having th cue ball pot the black at the end, i can animate a 'break' (beginning shot of a pool game).