Examples:

• If we're going to do this, it's now or never.
• With all that's going on here, it's now or never.
• If we're going to do this, it's now or never.
• If I'm going to administer the Tretonin, it's now or never.
• Well, she's not here, so it's now or never.
• It's now or never and I'd rather it be now.
• If you have any questions, It is now or never.
• If you want to give up, it's now or never.
• Well, if we're gonna do this, it's now or never, man.
• It's now or never, because I'm not looking back.