There are a LOT of factors to consider. When how and where your team strikes, who they target and why, what characters are on earth at the time etc.
this is a sly way for you to solicit some fan fic...
Well I planned to give the team prep say 7 days and I would a good idea would build a machine to amp one of the team members mind to do a planet wide mind control using everybody it worked on for the attack, including villains of DC earth that the mind control worked.