My dad (WWII Pacific Theater, Marines) got up to about 2 to 3 hours a day of meditation. He also read a lot on zen, philosophy, and spirituality.
I think it helped him quit a bit, over the years he certainly mellowed, though he never spoke about his experiences
but once very obliquely.
I would say meditation has helped me sort things out more that anything, The zoloft ain't bad either, but it only does so much, the rest is on me.
Good luck to you.