Can you suggest a couple of channels? I've never played RuneScape but those videos sound right up my alley.

Not Runescape but a similar grindfest - playing the largest Factorio mod, Space Exploration. 300 hours plus in ~5 hours of video

https://www.youtube.com/watch?v=8hRJ-CcwvrI&list=PLtyo3aqsNv...

There are definitely factorio mod(pack)s which are more of a timesink: seablock and pyanodon's spring to mind.

Start with Settled's swampletics.

https://youtube.com/playlist?list=PLWiMc19-qaA3u1ZawZQIKAh0B...

The other good one from the same channel is Tileman, where he is limited to only using tiles that have been "unlocked"

His current feature is Lowlife, where if he takes a single point of damage his account gets deleted.

Not op but one my favorites is: https://www.youtube.com/@Settledrs

Very entertaining to watch and explains things so even non players can understand the sheer absurdity of some of the attempts.

Two "extreme one chunk" style accounts in which the creators are or should be heavily medicated.

Verf - https://www.youtube.com/@VerfRS

Limpwurt - https://www.youtube.com/@Limpwurt

Man runescape was my life for a long while. Its still the only MMO I know which actually has unique and rewarding quests, activities, and mini games. There's something like 150 quests, most with completely new NPCs, new map environments/interactions, item, skill and map unlocks. For example to gain access to the best sword in the game (at the time) you had to do a quest where you were travelled to a monkey island where you had to sneak around, be creative, defeat a bunch of apes and the boss. And it was actually fairly difficult, you had to prepare for the quest and dying meant losing almost all your items. Nothing like go here kill 20 foxes, come back.

https://runescape.fandom.com/wiki/Monkey_Madness

I hit my limit at 83 mining in Runescape.

The grind sure is relentless!