recipe for 30 minutes of peace and quiet

Put the baby down for a nap.

Send the girls into the living room for "quiet book time".

Let the oldest discover that a chipmonk lives inside the wood pile just outside the window, which they promptly name "Princess".
Instruct said chipmonk to play "peek-a-boo" with the girls, peeking out at intervals juust long enough to keep the girls interested, whispering as quietly as they can and sitting as still as statues so as not to scare her away!
Go grab a cup of tea or coffee and sit quietly while it lasts. (Or, if you are like me...go grab your camera and join the girls for the fun!) :)