Excellent point. I bet we (many of us professional software developers) are so used to the concept of man-hours that we may be grossly misinterpreting the 1300 hours figure. It could well be up to 1300 times 30 people.
Spreading 1300 manhours for 30 people over 22 months seems a bit thinly spread as well, if you ask me.
8 hours a day * 200 working days = 1600 hours
With 30 people working just a week (5 days), we're already at 1200 hours.
Maybe they got their hours wrong? Or it's not that impressive (I'm a grumpy old man).