Ncdu takes ages to run on my system, its like 500GB+ of storage space, but it takes roughly an hour to finish scanning, probably a bit less, is there any alternative which either constantly monitors my files so it always knows the sizes for me to navigate or is significantly faster than Ncdu?
Taking an hour doesn’t sound right. Is it a disk or solid state? Do you have an unusual amount of directory hierarchy?
If you have a disk, does it have SMARTT errors reported?
Which filesystem are you using?
Yeah I don’t think this is an ncdu issue but something is broken with the OPs system.