Double Decoction Doppelbock

It's settled. I'm going to attempt to find the time to brew a Doppelbock this week. Complete with a Decoction mash. I have a massive yeast cake just begging to be dumped on, if you know what I mean. So, I just need to make a little room in the kegerator, and I should be good to go. Well there is one more item that I will need....Time.