How long does it take dysport to completely wear off? I still have a very heavy feeling with my eyebrows 6 months later.

Dysport should wear off around between 3 to 6 months for 95% of patients. That means 5 % of patients won't follow those rules. I don't expect it to last much longer though. Maybe a few more weeks... Next time a little less Dysport might be better for you. Good luck! 

I would say for most people, the effect of Dysport lasts from about 3-6 months.  There are some people for whom it may last a bit shorter or a bit longer, so it is possible that you still have some effect 6 months after the treatment to your forehead.  I would not expect you to have much effect for very much longer though.  

Dysport, like Botox and Xeomin, lasts on average for 3-4 months.  This is just an average, however.  I doubt it will last too much longer.  Make an appointment with the physician that injected you so that you can review your concerns with him/ her and review your pre/ post injection photographs.  I wish you well!