I made 100s of creative projects and failed experiences before getting there. Don't get scared by that number. All it means, is that it is possible to do in 60h. Some would take 600, others 20.
I threw that number away to put it in context with the 4 months since the first prototype. I could only work from time to time. Some times not touching the code at all for weeks.
This is far less than I expected, which usually means I am hopelessly out of my league in the topic. Great job :)