New RV concrete pad - how long until I can park on it?

I did the same but did 6" with mesh and 50 amp for the rig. My guy said a couple of days. I was on it in three and have been since except when camping. No issues here. Great addition. I agree with Kurt though. Ask your concrete guy to be sure. It all depends on your climate and how much drier they put in the mix...

Edit: I see your guy said 3 days. I'm sure that is fine then. I was right on mine in 3 and all was well. Congrats on the new spot...