As Yun Lei read through one book after another, the hours passed him by. He had estimated that he would be able to read through everything in about 10 hours. However, his calculation had been wrong because he had forgotten to take one simple fact into consideration: all the books there were written in the Wolf Tongue.
Because of this, he wasn't able to read it as effortlessly as he would have otherwise been able to. It took him nearly 13 hours to get through everything, but the added three hours to his estimation meant very little compared to what he was getting out of it. By the time he was ready to leave the library, he could say with confidence that he possessed all the necessary data to fully understand the Wolf Tongue.