It is not a console command. You can make it faster or slower. If you want the slowest speed the the timescale needs to be changed to .2 and the fastest is 2. You can set it even to anything in-between if you want. You need to be administrator, simply press the "T" key (like you would to say something) and then type the code below.
/timescale .2
For slowest.
/timescale 2
For fastest.
/timescale #
Place any number between .2 and 2 where there is a # sign.
Hope this helps. :)