here are the steps for a logical playtime duration of an SWF movie. The length/ duration of the movie is calculated by dividing the number of frames by the frame rate speed. Now that was the main time line... what about the other movies nesting inside the _root and its successors? run a tree calculation if possible and then just calculate the acumelative duration. That's just one theory .. not even practical to force a huge overhead on the clients web browser for such a think... or even the serverside script and banging your server. If you could give abit more details about what you want to do... and why you need the duration for... it could be easier to answer rather than general answers. HTH. M.Saleh.E.G Web Developer Login Innovations U.A.E 97150-4779817