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Is better to wait until the first day of the month: that day high score lists get reset and is "easier" to get a trophie since high scores get lower the first days and those super-high number 1 scores are not there any longer. The trophie giving is at the end of the day you submited the score, and if the next day you got the trophi, someone gets higher on the list than you: nothing happends. You'll still have your golden trophie for the rest of the life of that account.