Demonoid Invites - how much time to wait?

Hi,

A few days ago I sent couple of my friends an invite to Demonoid.com
Now it says:
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You can not create more invitations at the moment
Invitation codes are limited based on time since last creation and other factors.
Please check back this space, you'll be notified here when you are able to create an invitation again.
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Anybody knows when will it be available after I get this kind of message?
Have lots of buddies that I want to invite to the site :)

Thanks in advance,
daredevil239

I get new codes about every month.

Thanks for the reply. Hope same will be for me :)