Did you even bother to read the FAQ of the pool you're sending your miner(s) to?

How often do you send payouts?

We send ongoing payouts as soon as Bitcoins are back from exchanges. We usually send payouts couple of times per day.
What is the minimal balance for payout?

Ongoing payouts are for balances of 0.01 BTC or more. There's also a once per week payout for 0.001 BTC balances on Sundays.
I made a mistake in my username / BTC address. Can I change it?

This bit is in case you got enough 'Ready For Payout':
If you made a mistake, your username probably isn't a valid Bitcoin address and payouts were never sent to this username. In this case just message us on Twitter or Bitcointalk and we'll correct the address. You will need to provide a valid address that is different only by one or two characters to the wrong username. This is secure as it's impossible to purposely generate address so similar to another one.

FYI, User name is case sensitive.