The "normal" use of the one year/1000 hours is that it requires BOTH the completion of a year (12 months) AND having at least 1000 hours. At that point, the person has met the eligibility provisions and now has to meet the entry requirements, which would normally be the next following or coincident semi annual entry dates. That combination allows us to keep out participants as long as legally permissible.
Now, insurance companies and brokerage firms are notorious for wanting to have provisions that bring people in faster (because that's how they make more money by having more assets to manage), so you do need to confirm the exact language that your plan uses in this case.