One month...
That's how long Ashton secluded himself inside the Grand Library. During this time, he had completely foregone his regular training and was focused on resting.
He did consolidate his recent breakthroughs but that's it. He didn't practice, didn't try out his new High-Order Spells, etc. He took it easy and instead poured his attention elsewhere.
Most of it went to his research...
The blueprints he received from the Undead Dragon's Hoard were fascinating. While he didn't initially understand what it all meant, that didn't stop him from admiring the complex designs that were depicted in each of those papers.
Sadly, one month isn't really enough to completely understand the language used on the blueprints. The materials available to him aren't enough to decipher the language itself. Nevertheless, he still made progress at least.