How long until Dysport wont migrate or move? I am currently undergoing TMS (transcranial magnetic stimulation) for depression.

I would follow up with your injector about their recommendations. 48 hours should be a good timeframe, but it can take up to 2 weeks for final results. Hope this helps.

I would recommend you wait 24 hours after your injection before resuming your TMS.  As a general precaution, I usually recommend my patients refrain from any extra activity for 4 hours following Dysport injections and avoid strenuous activity for at least 24 hours.  
That being said, if you still have concerns about your treatment, I would recommend following up with your doctor to discuss any and all questions or concerns you have.

I would imagine that 48 hours is enough time after a treatment, but this is not based on medical studies that have been done.  I'm sure you can imagine it would be difficult to study, as not many people would sign up for a study that involved trying to provoke a risk of treatment.  I have my patients resume their normal activities after 48 hours, and I do not know that adding more time to this limitation is beneficial.  Good luck!