I started in July 2012, and I worked at least 1000 hours before the end of 2012, so that counted as a calendar year in which i worked at least 1000 hours. I easily hit 1000 hours in 2013, having worked there the entire year. I hit 1000 hours approximately halfway through 2014, becoming 100% vested after about 2 years of employment.

Maybe my original post was misleading, if you can tell me what you misunderstood then I can edit it to clarify. Regardless, I assure you that I was 100% vested in mid 2014, after roughly 2 full years of employment spanning 3 calendar years.