Off hand, I would be assuming that you will be making the time, since you are asking how much practice.
Most people I've talked to say about 50/week. But these are people at 200 and up. So I think what they mean to maintain that level they have to do 50/wk
when I was about 10-15 pins below what you're shooting now, I practiced 6 games/set, 3 sets a week for 2 months, I finished at 180.
But I would say, it depends on how fast you learn, and Bones is correct. Don't do too many games in one go. You might actually develope a bad habit. Try the 3X a week. Wether it is a good set or bad. pack it up.
Oh another thing, at the level your in - practice sparing more. Its the easiest way to go to the next level.
regards
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DARK BEER IT IS THEN!