Haven’t quite hit the imperial 200 yet, but sweet spot base, sustained power build, century is what I did in the lead up to LBL which was 275km. My legs weren’t the issue anyway on what turned out to be the toughest day I’ve ever had on the bike.
I re-did sweet spot base, sustained power build and a partial century into my late season Audax too (which I’m hoping will carry through to my first gravel grinder too in a couple of weeks!).
Although I generally listen to the advice of the guys (particularly regarding FTP being the key), last season, thanks to a crash, I did a purely inside block in the lead up to a 200km ride, and felt I missed a few longer outdoor rides.