How long does it take to remove a coin from mintpal?
They didn't say that, however normally on a weekly basis Mintpal removes dead/low volume coins.
If no action is taken after a certain amount of time, we will bring it to their attention again. Moolah really wants to distance themselves from any scamcoin.
Either way it's great that they're acknowledging it and hopefully soon there won't be any confusion with new people joining the community.