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My suggestion:
It would have been nice if they reduce the time of transition to a new team player. I think that 12 hours should go to a new team. A little too long to wait for the finalization of the purchase transaction.
The reason on why there is 24 hours waiting time before the player officially go to the new team is to allowed GA (Game Assistant) to do some investigation in order to prevent some sort of cheating during the bidding.