Store is opened, or if ten duels are won. The dropped items are stored in the backpack after the player's death, while visiting the Main Menu, after a trade is completed, if the Mann Co. Is running only one instance of the game.Is responding to in-game drop notifications while not utilizing external programs to do so.In order for a player to receive an item drop, they must be 'actively playing' i.e they meet all of the following criteria:

The amount of time a player can save up is capped at double the allotment of a single week (roughly 20 hours). If a player plays less than the playtime cap in a week, their leftover time will be added to the next week, so a player who does not play for one week will receive twice as many items the following week. The system resets each player's playtime cap every Thursday at approximately 00:00 (midnight) GMT. Supply Crates and other usable items drop on a separate timer, meaning that these items do not affect the interval between regular drops. Playing beyond the cap will not yield additional items. This cap has been estimated to be 10 hours each week.

The system has a cap on the amount of playtime in which drops can occur. Players are guaranteed to find items at regular intervals of 30 to 70 minutes, with an average interval of 50 minutes. The current item drop system was introduced on April 20, 2010.

A bar chart displaying the distribution of item drops per week.

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