I think the pacing is just right with all those timeskips as well. It just shows that the passage of time is trivial for the MC because of his long life.
Nonetheless it was a mistake to binge the series. I read this chapter, came to the last panel and nearly broke inside. That smile is just too much. He will most likely fulfill the promise. But damn... First he spent most of the time with Kaeha's mom because Kaeha was on a journey to perfect her swordmanship. Then he has to save all the elves and everybody and their children know that he will not be back for a few years. He comes back, Kaeha has twins and is already middle-aged.
Then Kaeha's mom drops the bomb on him on her deathbed. I understand that MC sees death as a new beginning, but god damn... stay with Kaeha until the end! It's over in the blink of an eye for you, but for her it will be her whole life! She has loved him all this time!!! God damn it, author! I simply had to stop reading for now because this is not good for my mental health :'(