One month was the worst point. It gets better from there until it's unnoticeable unless in a silent room. You will be surprised how the brain is able to both cancel out and then rebalance the sound input to normal (should your tinnitus be one-sided). Same goes for "cracks" that you might hear if the sounds are too loud -- they also go away in time.

I might as well note that anecdotally, barotrauma makes the tinnitus better temporarily. Maybe there is an explanation -- traumatic tinnitus can be at least alleviated by going into an overpressurization chamber immediately after the traumatic event. It seems like even after the fact, a pressure difference has temporary effect. For example, my tinnitus feels better after ascend on flights, even though in this case it's underpressure.

The best motivational video that I still think of after 10 years is this: https://youtu.be/eOU0JhkHY3w