[jaggederest]

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...

[rcxdude]

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