Math.com defines a billion dollars as 1,000 million dollars or a one followed by nine zeros: $1,000,000,000. It would take 10 million $100 bills to total $1 billion in cash.
To put it in perspective, if a person was paid $10 an hour for his job, he would have to work 100 million hours to earn a billion dollars. If that person worked eight-hour days, and never took a holiday or weekend off, that would equal 12,500,000 days worked or nearly 34,247 years. A job that paid a million dollars a day would take nearly three years to earn a billion dollars, using figures from Math.com.