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Candyland, the classic board game, does not have a specific physical size as it is just a cardboard representation of different colored squares. It’s usually played on a table or floor with two to four players.
As for the average playtime for girls (or anyone) playing Candyland, it largely depends on their age and level of interest in the game. The official recommended age range for this game is 3-6 years old. If we assume that “一般女孩子” refers to young girls around this age group, a typical gameplay session would likely take between 10-30 minutes.
Please note that these assumptions are based on my understanding from text data alone and may not accurately reflect individual preferences or playstyles.