There is no timeframe, however, if planning to see Pena, Fischer, Adamczewski, Dinges, and Payne all together, I doubt they will ALL still be here mid June.
The sooner you go the better, as I'm expecting movement in the next couple of weeks. To be honest, I can't believe that Payne is still here, and as well as Adamczewski is playing, he might be the next to go... Fischer's days must be numbered as well. Probably a good chance all 3 are gone by the end of May.