It really depends on what I'm doing. I don't have a specific career, and many time I make nothing at all for hours or days at a time.
When I set myself to a particular task though, I'd say my peak earnings are around 48m/hr as a smuggler, 18.5m/hr as an archaeologist, 12m/hr bounty hunting, 10.2m/hr hauling rare goods, 9.5m/hr hauling common freight, and 4.4m/hr mining.
But it's not about the Cr/hr for me.. as long as I'm enjoying what I'm doing, the credits are not much of a concern. There are times when I will push myself to earn, earn, earn - usually when I decide something like "I think I'd like to buy another Anaconda/Corvette/Cutter and outfit it today", then the white gloves come off, the sleeves get rolled up, and it's time to get to work.
My total assets are around 4 billion, with a fleet of around 40 ships, all fully upgraded, fully engineered, and rigged for different jobs. In the realm of total assets / time played, I'd put the average earning right around 450,000 /hr, though as I said, there are days, sometimes weeks where I make nothing at all, or even lose credits. A little less than a year ago, it mattered to me. There were certain things I wanted, and I set myself to obtaining them. I did. Now all I want to do is have fun, and I do.