It depends on how many critters you're trying to feed. Turkeys love corn if you have them and often travel with deer. Density & coverage of corn from spinner is also determined by speed setting.
If deer are cleaning up everything each day, set a little higher; if corn is left-over each day then cut back. In Texas, a 2 sec spin would last about seconds on the ground!
Agreeing with esshup; no 2 feeders are alike in output. Play around with them until you get it tuned...not rocket science,just common sense.