I'll wait as long as I can, and even engaged in a one on one just so my teammates can get to it (either getting killed or losing out on the pickup). New to crucible and generally do not play an agressive front position anyways so it doesn't do me as much good as it does to other players (special ammo and primary for my scout works for me). If I don't see anyone coming then I'll grab it. But only when I see red on my radar.