A rough sandbox and a few things to start the PCs off (e.g. an initial job, or patron) is often how I do things these days, but once the starting phase is over the players have normally grounded themselves in the world and start following up on the things they’ve found that interest them, so I’m used to a certain amount of improvisation. Good to see you’re looking at a longer view for the game. 35-40 sessions is a long campaign for us these days, and I’d like to get back to something like that. TEA is something I’ll be keeping in mind.