Audio recording: how much space will be used?

[Vance14]

I need to record a lecture using my phone and a audio recording app. How much space on my phone will be used in an hour and a half? Is there a place with a chart? What bitrate do the recording apps use?

 

[Ricky Babalu]

You should have plenty of space.

Recorded a 30 min. file with the Droid X recorder: 2586 KB