There are 2 types of audio advertising durations available on Mumbai Metro trains: 10-second ads and 20-second ads, allowing brands to choose the format that best suits their campaign objectives. The 10-second audio ad format is available across 15 active metro trains. Each train completes approximately 25 trips per day, and the advertisement is played 3 times during every trip, resulting in 75 ad plays per train daily. Across all 15 trains, this delivers a total of 1,125 audio ad plays per day. The 20-second audio ad format is available across 28 active metro trains. Each train completes approximately 10 trips per day, with the advertisement playing 3 times during every trip, resulting in 30 ad plays per train daily and a total of 840 audio ad plays per day across all 28 trains. A maximum of 3 brands are accommodated per train. Audio advertisements begin once the train departs from the source station and are played alternately with a gap of one station, ensuring repeated exposure throughout the journey. This advertising solution is available on key Mumbai Metro corridors, including Versova–Ghatkopar (and vice versa), WEH, Link Road, and Chembur–Mandale (Mankhurd) routes, offering brands high-frequency engagement with daily metro commuters.