flickr: Oskars

Some possible answers at ERE.net.

"It is taking so long because it took you four weeks to finalize the position profile [job description].

"It is taking so long because you take forever to respond to the candidates I submit.

"It is taking so long because you do not get back to me after candidate interviews. Having the candidate die of old age waiting for the manager to think, discuss, compare, contrast, evaluate, reflect, confer, plot, map out, or my personal favorite, "sleep on" is pitiful. Once again, 24 to 48 hours to make a decision. Do you want to move forward or not? (A client once told me he had to "ponder." I hate ponderers.)

"It is taking so long because you change the position profile twice a week."

Again, managers don't often like hiring. (View proof, from "Jobs That Don't Suck") So it's no surprise that they often take a long time to "ponder" or whatever it is, keeping tons of qualified people hanging.