A hard SEO task again?

Hours ago, my client wants me to put at least 5 links on all of the blog posts I ever had in his website from the start to the finish. I have over 50 blog posts there and I have to re-edit them one by one. Also on his tasks, he wants me to update all country pages of his SEO blog, and he has a total of over 70 countries stored and to update them one by one manually. I'm so tired and it take me up to 5 hours to complete the tasks. Finally, after an exhausting task I'm finally completed the search optimising task that is so hard for me and I didn't inform him anymore about my work, because I know he will monitor it once he checked without informing me.