1 week or 8 week with cs?

[susiesue123]

I am doing s.world and the weight is coming off, but very slow! am away in 2 weeks time and was thinking if doing cs for 2 weeks just for a boost, but everywhere says about the 8 week challenge, anyone just done for an event etc for a boost? does it work short term?
thanks x

 

[JustForMe]

it was just a short term challenge a while ago