Not all claims are initially denied. I was approved within a couple of months after I applied. At the time I was r/r (I'm now s/p). But I was in a powerchair full-time and over 50, both points in my "favor". I applied on-line which was an easy way to file cause it allows you to save your application & go back to it later to add details & finish. It probably took me a couple of weeks to gather all the info & complete the application.

Good luck!