Us fans understand it's a hard season. Particularly when Iliman left, it went from hopeful to "oh shit".
I think I'd give Hecky until December. If we're still really frustratingly "off it", maybe then appoint an upcoming manager that will want to get promoted from the Championship and have the pedigree to do so - then sign some very good Championship players in the January window (that the new manager agrees to).
Note: Even this feels harsh on Hecky, I'd like him to move upstairs not be sacked.
The majority of managers changes don't work. Very low probability of a manager change helping (no idea how to provide any evidence or stats for this!). Appointing Hecky really did work - a lot of thought needs to go into the decision before dispensing of him.