hi answer to your question. What time does the beach close in kalamaki. well I went in october. It was a winter view.but funny enough warm at the same time.the beach was nice and deserted. so me and my wife went between 9am to 15:00 then about 18:00.So we still went when it weren't to dark. or sea to rough.So it depends what time of the year you go .I surpose in the peak time in the summer it's open nearly all day .There was a hotel and there tarvena was open in the morning above the beach .lovely place .We really enjoyed there.