An MP3 file encoded at 128kbps with a size of 6.35 MB corresponds to approximately 6 minutes and 56 seconds of audio. At this bitrate, which is considered standard for podcasts and web audio, one minute of stereo audio equates to roughly 1 megabyte of data. Learn more about digital audio basics at George's Music . How many minutes are in a 25 MB Mp3 file? - JustAnswer