Yeah, of course it varies place to place but I think for the majority of at least somewhat developed countries and urban areas in less developed countries 50Mbps is a reasonable figure for “normal home internet” - even at 25Mbps you’re looking at 4½ hours for 50GB which is very doable if you leave it going while you’re at work or just in the background over the course of an evening
Edit: I was curious and looked it up. Global average download is around 50-60Mbps and upload is 10-12Mbps.
Yeah even gpt4o couldn’t keep track of encounters, run battles etc. in my case…
I think if you wanted to do it mechanically consistently you’d probably need to integrate it into a vtt where you give it context and potentially fine-tune it to give quest related summaries & gming rather than just “stuff”