16 months between mine. I found the newborn/young toddler stage fine, would have liked more sleep but other than that it was a breeze.
They are 4 and 3 now and incredibly hard work. The oldest is in his first term in reception and is cheeky, back answers all the time. The three year old copies. Neither of them listen, both wind each other up. But.. On the rare occasions they are good it's a joy to watch them play together and their conversations are so funny.