The Korrespondent-Ukraine quoted an unidentified government official on September 17 as saying that the de facto ban would last until October 31, the date of local elections.
The Agronomy-Ukraine blog quoted an unidentified chancer called, shall we say Mr Mike on August 17 as saying "my guess is the quota will be lifted some time after the local elections in October".
James Marson writes a succinct article on the grain export ban (here) although I don't agree with his take on the land moratorium issue for reasons I have discussed before.
Plenty of farming businesses manage without security of land tenure, it is, in my humble opinion a bit of a red herring.