How long can it take a bleeding aneurysm to kill you?

Depends: Depends on where the aneurysm is located (e.g., brain, chest, abdomen, arms, or legs), but it's certain that a bleeding aneurysm - one which has ruptured - will result in death no matter where it is, so it won't be too long. There's no way to generalize the time frame.

From minutes : To never. Finding and preventing is best! but with leaking aneurysm treatments with endografts or surgery are life saving.