If 20 mins of informations can legitimately be condensed into 20 seconds, it sounds like the original wasn't worth reading in the first place. Could have skipped the llm entirely.
Effective and information-dense communication is really hard. That doesn't mean we should just accept the useless fluff surrounding the actual information and/or analysis. People could learn a lot from the Ignoble Prize ceremony's 24/7 presentation model.
Sadly, it seems we are heading towards a future where you may need an LLM to distill the relevant information out of a sea of noise.
But if that's the only place that contained the information you needed, then you have no choice.
There's a lot of material out there that is badly written, badly organized, badly presented. LLM's can be a godsend for extracting the information you actually need without wasting 20 minutes wading through the muck.
Not all content is worth consuming, and not all content is dense.