awaiting tribunal- how long?

to cut a long story short was on ESA contributions based for a year but never should of been in that group ,the DWP put me in there instead of the support group refused to move me after the year they said i needed to reapply for ESA which i did then got told i needed an assessment went for that got 15 points but the DWP still refused to pay me anything so it went to manditory reassessment, the assessor gave me 0 points i am now awaiting the tribunal any ideas as to how long it will take?

ohh forgot to mention the reason why the assessor gave me 0 points was she did not look at my medical records or asked me any medical questions and she also noticed that i had my false leg on and walked ten feet to the room and sat on a chair for an hour.,ironically i couldnt use my wheelchair that day it was being repaired..