It can be much more than this. A short order cook might prepare $1,500 worth of food in a shift. $30,000 in a month. It's hard work in a busy diner.
As an extreme example, at one point, WhatsApp had 40 software engineers and 400,000,000 users. That's 10,000,000 users per engineer. If a user was worth $1/month, they were each responsible for $10,000,000 per month in revenue.
That's an extreme, but even at my company, for example, one engineer is responsible for about $200,000/month in revenue.