I've been trying to come up with a script for a twitch bot that can deal with one man spam. Effectively this script would work by saying if username sends X amount of messages within lets say 10 seconds then the user gets timed out. I've been trying to code this for a while without any luck if anyone could help.

There's many mIRC addons/snippets/scripts to be found at mIRCScripts.net. Have you had a look at this: https://mircscripts.net/jEsdy - You might want to adjust the values therein...