I’m sure crew and others will give a more detailed answer but - it depends!
I think the general trend is to maximum utilisation so, yes, in general on longhaul for East Coast USA it is 1 night and West Coast 2 nights. However, don’t forget (for example) New York used to have a dayflight back to the UK so I guess some crew would stay for 2 nights to bring that back.
On other routes, it might depend on how often that destination is served, or even how often it is served by a particular aircraft - for e.g. whilst the Middle East is generally one local night, I’ve heard of Muscat in normal times getting multiple nights for some crew - I think it may be if, say, destination served by a mix of 788 and 789. On other occasions crew might simply position back as passengers or be supernumerary - ie a 788 with 10 crew because the outbound was a 789 or whatever. Hopefully that is broadly accurate!