I've been back at work for 6 weeks now (4 part time and 2 full time), and just today, I finished going through the mail that had accumulated while I was gone.
And that was just the physical mail. I still have a folder of email to come back to and "handle".
I long ago gave up on feeling caught up at home. Perhaps I should surrender the hope of being caught up at work, too- just embrace the never-ending to do list in all aspects of my life!