Private keys are generated on the client-side, so they never ever leave your device.
Actually you get your private keys right before the account is even created since we only get public keys from the person who signs up and create an account.
So you pretty much get your keys instantly.
What? I am confused xD
Let be ask in another way.
Is there any waiting time for the people when they sign up?
No waiting time - it's an instant signup service.
It takes 1-2 minutes to get an account for average user going through the process.
Cool, thanks for the answer! :D