How long will my husband have to wait to be declared disabled by the va? He filed for 100% in June 2010.?

My husband filed for 100% diability with the VA in June 2010. t has been several months since they have said they were working on his claim. He also has several other claims on file. They have been sending him to get treatment for various things like degenerative disc disease involving the lumbar back, knee degeneration, PTSD, prostate cancer--to name a few. why haven't they declared him 100% disabled sincehe has already been declared disabled by the federal government. All of these sevice connected injuries were not completely diagnosed and he was found to be disabled by social security. Will this take 2 years or more?