By now, he has begun designing the formation breaker. His attention is entirely focused on it, so he doesn't want any interruptions.
His cultivation is going along nicely too. The progress is slow, and it will take him ten years to advance to the second transformation of the golden core. But the progress is steady, and that's good enough for him.
His progress in terms of cultivation has to be good enough for him if only for the fact that he doesn't need to focus on it and can do other things to achieve it. But his progress is also fast, so he can't complain at all.
The average time it takes other golden core cultivators to complete one transformation of their golden core is 50 years. He is making that much progress in 10 years, which makes him 5 times faster, so he definitely can't complain.