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    private static final int CALCULATION_INTERVAL_MINUTES = 5; // The interval for calculations in minutes
    private static final double DECREASE_PERCENTAGE = 0.0024; // 0.24% decrease per interval

    private void calculateOffTime(Player player) {
        long currentTime = System.currentTimeMillis();
        Long energyOffTime = Manager.getLong(player.getUniqueId(), "energy_offtime", Mongo.rpg);
        logoutTimes.put(player, energyOffTime);

        long lastUpdateTime = logoutTimes.get(player);

        // Calculate the time difference in minutes
        long timeDifferenceMinutes = (currentTime - lastUpdateTime) / (1000 * 60);

        // Calculate the number of 5-minute intervals that have passed
        int intervalsPassed = (int) (timeDifferenceMinutes / CALCULATION_INTERVAL_MINUTES);

        // Calculate the new energy value
        double oldValue = playerEnergy.get(player);
        double decreasePercentage = DECREASE_PERCENTAGE * intervalsPassed;
        double newValue = oldValue * (1 - decreasePercentage);
        newValue = Math.max(0, Math.min(newValue, 100)); // Ensure value is within 0 to 100
        playerEnergy.put(player, newValue);

        // Player is online, reset the logoutTime
        logoutTimes.put(player, null);

        String formattedValue = formatEnergyValue(newValue);
        player.sendMessage("Calculations for energy loss completed! New energy level: " + formattedValue);
    }