Is it too long to pump for 45 minutes?

Is it really necessary to pump for 45 minutes? I'm just curious, doesn't that seem like a bit of an exaggeration? I mean, surely there's a more efficient way to achieve whatever it is we're aiming for, isn't there? It just seems like a lot of time to be dedicated to this single task. Could you please elaborate on why such a long duration is necessary? I'm genuinely interested in understanding the rationale behind it.