When you upload a file to our order form, the duration of each audio or video file you upload will now be automatically detected and input into the form. The audio duration is rounded up to the nearest whole minute. This file detection works for 95% of file extensions. The most notable exception is with .wma files, which are encoded in a proprietary format that does not function with our auto-detection feature. That said, you can still upload .wma files and any other file to the order form. If the duration cannot be determined, you will be prompted to manually enter its number of minutes.