I LOVE doing Jazz dates. 5 guys who've never heard the songs before, all set up live (bass in the iso) and fully track 6 songs in 5 hours, tighter than any other band I've worked with. They all bring in top notch gear with top notch playing, sight read it through once, take it down, and bam.
Then you go back to the metal world and take 4 hours just to record and edit drums for one song.