I also have the similar model Hp 1010 bought appox 2 years ago. I do about 3-4 printouts a day on the laser. Ocassionally a bit more bit less. Since the day I bought it, I have not had the chance to replace the toners yet. You shoud easily get approx 2000-2500 from the toners. When you buy replacemnet toner, it will probably give you a higher yield output.
Overall the cost per page on a mono laser is very cheap. The outlay is expensive, but much cheaper than inkjet.
HP laser printers, in my opinion, are among the best.