statement of reasons

as stated , i have won my tribunal against the pip , non dwp are requesting a statement of reasons , can any-one whos been through this tell me what to expect, they requested the statement on 17th july , rand today they claim to not have the statement yet, i won my appeal on the 27th june , how much longer can i expect this to go ? origionally i appealed in august 2016 , so this has been going on over a year, my life and health have pretty much plummeted to floor with the stress this is causing me