That is a lot of copies.
It seems sort of unreasonable, really, if you don't know why a book has to sell that many. Honestly, one thousand copies, essentially sold by hand, while holding down a full-time job, should impress pretty much anyone. And in truth, it is impressive!
But you're not trying to impress a person. You're trying to impress a Profit and Loss Statement (a P&L: example here). This financial statement is used to project profits for a publishing house. In the case of debut writers, the "Revenue" section is guess work, based on how books like theirs have sold. In the case of non-debut writers, it's based on their actual past sales numbers. If the "Revenue" doesn't exceed expenses, book 2 (or 3 or whatever) is in trouble.
The P&L is one of the most common causes of a book getting turned down by a house, particularly in the case of authors who were first published by a small house or self-published. It's the P&L that agents have in mind when they say that you must have 5,000 copies sold in order to be considered for a traditional publishing deal.