This thread is awesome.

It's hilarious that on a forum where people constantly throw statistics around, over half the people here have no idea what variance means.

Variance per hand-- does NOT depend on how many hands you play at once.

Variance per time period(which the OP is referring to)-- DOES depend on how many hands you play at once. In fact, it INCREASES with the amount of hands you play at once. Should be self-evident...