I posted this before, but Reading's takeover took 6 weeks after submitting to the FL. As someone mentioned above, Leeds took 4 to 5 weeks.
I think the issue here appears to have been an assumption and continual reporting of the fact that the the FL would somehow do this a lot quicker.
The question is though, were Reading & Leeds stopped from signing players on loan during that time.
I know we don't take much notice of takeovers at other teams, but I can't recall any other team being stopped from making loan signings during a takeover.