Okay. I've had my cbr600rr for a little while now. I'm still learning it. What should my rpm be arround if I'm cruising at 50mph arround 5k?

 

Welcome to the forum, sir (or ma'am?)! Please take a minute to intro yo'self with any pertinent background info and maybe put up a pic or two!

RPM's are dependent on your gearing, i.e. front and rear sprockets, and can vary pretty widely. Check out - https://www.gearingcommander.com/ - to play around and get an approximate idea of where you should be...

 

Welcome to the forum 1jdlee,
As a comparison, my F4i runs 4k revs at 50 mph.