Refresh Limit Dataflow

Hello guys

I have several dataflows that I use to update dashboards, but I use manual updating, clicking one by one for a while. What happens is that it starts with an error sometimes written "Error: You've reached the refresh limit for your account. Please try again later".

I already understood that I'm reaching a limit, but I still couldn't understand if it's because I'm updating several at the same time or if the amount of updates in the hour / minute is too much.

Obs. My account is already Pro

Has anyone had this error?

I apologize for my english .. I'm using google translator rs