They went pretty fast with performance improvements after launch and the first major update. There was a larger gap with the last update because they bought their publishing rights back and had to wait for all the legal stuff to settle.

So far they had one large update which added end-game content and another large update with a major balancing overhaul, which also reset character progress.

HLTB currently sets the game at 12.5 hours for the main story and 24 hours for main + side quests.

I’m planning to play it once co-op releases, the game seems to be in a good state and has enough content for me.