Audio prompts on time elapsed

Audio prompts are only available based on distance (every half km, km etc) but it would be great if audio prompts could also announce time elapsed (every 1 min, 5 mins etc). This would be great for timing things like couch to 5k, intervals, etc. But it would also be great when people only have a fixed amount of time to be active in (eg a lunch break) and want to keep track of time without having to check the time.