Nope, no way to speed it up beyond what's already done for the Kraken. Ten days is pretty average for a Kraken going on patrol, and usually there aren't that many things to tank in a month. If it still has gas in the tank, it'll still work for light tanking duty - give it some extra armor, maybe ablative, or a shield item.
Well, you can also just sell it and build a new one, with a good enough manufacturing base that takes less than ten days easily.