Time it takes to call and leave a message for someone who hasn’t called you back: 30 seconds.
Time it takes to be annoyed and have an inner dialogue about how annoying it is that this person, and just about everyone else it seems these days, never calls you back, or calls at all, they just text cryptic incomplete sentences and think they’re communicating, which they’re not - that’s not communicating!: 2-3 minutes, or possibly much longer.