To kill a chaos terminator?
Over nine thousand?
no matter how many, it is always only one that delivers the killing shot
I don’t think any single las shot would kill it, if we’re talking about standard lasguns. It would be a matter of heating the armor until it melts, and eventually burning a hole through him.
A long-las would probably put a dent in it, but wouldn’t pierce the armor. Several shots in the exact same area would probably cause serious damage.