I hate all of you with sleeping babies!!! I hate you, I hate you, I hate you!
Let them eat cake! Or rather...let the boy sleep! If it were me I would move his bedtime a little earlier so he wouldn't sleep quite so late, but maybe that won't work for your household routine. Sleep is sleep, so don't mess with it if you don't want to!
12-13 hours sounds very normal (unless you're Peri). Owen was sleeping 13 hours uninterrupted by now. It was heaven. Those days are only a distant memory for me now. Ahhh...I have the song "Memories" playing in my head...