Wyeast 1007 German Ale=First Blow off

I've brewed 25 batches so far with no blow off. I started using pure O2 for aeration around 10 batches ago and read that it might be good to use a blow off tube. I was starting to wonder if it was necessary since I use a 6.5 gallon bucket and fermcap in the boil.

This morning I checked the temp on my fermentation chamber it was 59 and I could hear bubbling. I almost didn't open it before I left for work but decided to at the last minute. Glad I did because the bucket was swelled up and slightly hissing. It would bubble normally for a minute and then let out a bunch of bubbles at once. I decided to crack open a small section of the lid for today while I am at work. Moral to the story is wyeast 1007 is a beast.

 

My plan is 3-4 weeks primary. Two weeks bottle priming at room temp. Then 3-4 weeks in the bottle at 35. Of course this is just the plan. The yeast will do what it wants. I'm not going to rush it. From your experience do you think 3 weeks will be enough time for a 1.059 OG?

 

Cracking the lid might not of been the best idea. When I got home yesterday there was yeast on the side of the bucket and a pool next to the bucket. I shut the lid and cleaned up. Now I have gone from insane fermentation to a bubble every 10 seconds on day 3. I pitched plenty of healthy yeast to begin with so I am hoping there is enough left to get the job done. I really hope so because what I cleaned up smelled really good.