Okay well spoilers for both Smuggler and Agent stories but, a certain figure from the Smuggler storyline who appears very briefly in the post alderaan part of act 1 appears in a holocall in the Agent storyline between Belsavis and Voss which you are told is 6 months old, meaning that act 2 takes less than 6 months. That is the only concrete timeline info the game gives you, that i've seen at least.