Hi Netty,
You didn't mention whether you are a physiotherapist or sports therapist etc?
Either way, you need to use your own clinical reasoning skills to identify how your client is responding to the treatment and then either continue or progress as you see fit. Relate what you are seeing to the anatomical knowledge you have, and consider whether the ultimate cause of the neural symptoms has been resolved or not. You did not mention whether the symptoms are L or R sided?
If it's an osteophyte or other bony anomoly that is causing the problem then the prognosis is somewhat different to someone who has tight scalenese due to whiplash, for example.
As for when the neural symptoms will ease, that depends on the level of damage there is to the nerves really. If whatever was causing the problems has been alleviated with your mobs & desensitising (assuming you used neural glides?) time will tell what damage has been done and how this will recover, or not, as the case may be.
Without knowing your client's full case history it is somewhat difficult to make a prognosis as I am sure you can appreciate! Have they got an ongoing rehab plan, and been advised on lifestyle changes if it's a work-related problem?
Good luck and let us know how you go!
Ruth Cheesley BSc(Hons) MSc MCSP
Chartered Physiotherapist