RandomTickSpeed command is cr@#king up my world...

I was planting some crops and I wanted to let them grow as fast as possible so I put the RandomTickSpeed to about 10000 (a lot, I know). When I was done planting all the crops I wanted to set the RandomTickSpeed back to the default settings. When I was trying that, I noticed that the Tab-button didn't work, so I typed the whole command. When I had done that I fought that the RandomTickSpeed would go back to normal but it didn't. Could someone PLEASE help me!!!
Greetings Derk.