Well, that didn't work. Maybe more than 10?
In an effort to avoid one more empty post, let me just add that I agree with previous posters that Gameloft seems to have calibrated the in-event currency rate so it is harder to rack up extra. But by the same token, I think they have also gotten much better at calibrating the timing of the event so there is a lot to do, but not so much that finishing the event feels impossible. That said, I am not looking forward to collecting for costumes—that always feels like walking uphill.