no idea... but i would expect it's similar to ring games.
is the game nlhe? if so, i would guess 70-80 per hour. this assumes that you don't have many people abusing the clock (to avoid being blinded out), "sleeping" (i.e., just timing out and letting themselves be blinded off), or other such pace killers. if these phenomenon are common, then a lot depends on the amount of thinking time given.
this is just a guess... people with more MTT experience can probably give you a better estimate.