You can see this by counter applied at the invitation panel on the right of your Google+ page, which shows the remaining number of invites for your account. There are 2 ways to send invitations now. Either you send the invitations directly by giving in the email of the user of send him the direct link for invitation.
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But still no worries guys as we have lots of invitations left for our loyal readers. 1 account with 150 invites right? :) We got more than one accounts so you can still roll on and keep joining Google+. If you haven't submitted your email address in the past, make sure to leave it in the comment section of the post.
Invitations Open- Leave Your Emails