Since it scales somewhat close to linear, you can just calculate it yourself.

And since you pay per minute on EC2, you can either chose to have 10 instances calculate a minute or 1 instance for 10 minutes. Either way, you pay for 10 minutes of processing time.

p.s. simplified but probably somewhere in a reasonable ballpark

There may be some info returned, but I didn't dig into in too much. Once I figured I could run through the whole set in less than an hour for less than 10 bucks, I had all the info I needed.