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Through these two weeks, Frank has been enhancing his soul and everything related to his divinity to greater and more refined levels. Unlike the other Gods (which he had already met again), he wasn't as masterful in the use of his own divine energy, and even with some of the memories of the ones he ate their fragments (such as Zudithe and Judith), he still wasn't able to do it perfectly, so he required a lot of training.
These two weeks went rushing through inside of Frank's Divine Realm, while the outside world had barely gone through a few days, although such a difference in time wasn't that much, it helped Frank not "waste" too much time outside, or so he thought.
Check "The Protagnist's Sister Is Actually the Strongest"!