Im guessing his main goal was to get the gate open but he probably could have whipped that out in no time but just told them 1 month. But what I really think is on his mind is how to fight Aizen, maybe hes working on a way to fight without your eyes or to break out of the hypnosis. I also think he and maybe Isshin and Ryuken are training the 3 other friends so that they are strong enough to protect Karakura town while their all battling in Hueco Mundo or SS whichever. Someone has to be left back to help defend the town since thats what Aizen is after right? 1 million souls in 1 mile.
I can't wait for the war cause I bet we'll get to see everyone fighting!!! excited.