How long does it take to make you illegible for rewards?

[xSephrone]

I like it when im doing 60% damage out of a 4-man squad. but because im just using ember sitting in the middle i wont get any reward after 5 waves in defense etc.

I wanna know how often i have to do something. how much time needs to pass to make you illegible to gain the reward?

[jeffrey]

You should be moving around the map to collect the drops. If you're not moving for over a minute, the game will count you as an afk player. 

[Husla]

Either its 1min or 2mins. Can't remember which. Also, you should collect items anyways. As they despawn after certain amount of items are on ground.