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Hi @cangeo welcome to the community. For Candy Crush Friends you collect stickers for boosters. You will get the lollipops when you collect 30 or 60 stickers. There are other timed boosters which will start immediately after you get them and will last for 2 hours or half an hour. These boosters (friendly fish, activate friends’ power, and coloring candy) will not be saved to your account so you can use them later. Hope this helps.