Mo Wuji did not immediately look for Yan'Er, she would be safer at Medicine King Summit. Furthermore, she had Xiong Xiuzhu there to take care of her.
When he returned to his room, Mo Wuji immediately closed his doors and started cultivating.
With 61 open meridians, his standard could be considered above average among cultivators. Even if he wasn't able to open more meridians in the future, he would still be able to advance into the Spirit Building Stage, or even the Transcending Mortality Stage.
To increase his cultivation speed, Mo Wuji used his spirit stones without restraint.
Once he started cultivating, Mo Wuji immediately felt like he had become a huge whirlpool, drawing boundless amount of spiritual energy which then flowed within his meridians.
In a short span of time, a spirit stone was sucked dry. At this point, Mo Wuji was no longer frugal with his spirit stones. When a spirit stone was sucked dry, he would change to another one and continue cultivating madly.