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As long as it needs to be.
I have no preferred length for any genre, though I find "murder mysteries" that don't have a murder till 1/2 way through a bit odd. Often that is building the repeating protagonists in the start of a series and can work.
Some multibook series are not really series as it's a single main story and can seem too long with deliberate cliff hangers. The 14 volume "The Wheel of Time" might be better as 5.
Some long books are good and some seem padded.
The Magician was one of Raymond Fiest's earlier works and later revised. It's a bit long, but splitting it in two for the USA market doesn't really work although there is a big shift in the story.
OTOH The original Foundation trilogy was created from serials and could work as a single omnibus, yet the much longer 1980s to 1990s Foundation books are huge, yet nearly worthless. I think the publisher pestered him to return to writing SF and IMO combining the "Robot" and "Foundation" universes explicity was a mistake.
Very many of the classic SF of 1930s to 1950s can't be much more than 70K words. In contrast I find Iain M. Banks, Peter Hamilton, Ken MacLeod etc a bit tedious.
Dune (1965 /1966) was maybe one of the first longer SF, but really if it didn't have space travel it would be rated as Epic Fantasy as it's essentially magic based. Fantasy was often still traditional novel length even in 1970s (though exceptions existed).
Romance and Detective/Mystery novels have hardly changed in length in the last 100 years and are still the most popular. Adventure / Thrillers have got much longer compared to 19th C to 1950s.
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