Originally Posted by
Bennylin1995
What time before depart did you receive the invitation or check eligiblity from the web ?
It currently starts at 72hrs prior to your flight until 6hrs before departure (cut off time) as has been explained to you already in earlier posts. It has also been explained to you that it is a fixed price bid where SQ tells you how much they want and you decide to accept or not.
Asking the same question multiple times will not change the answer. Be patient, you'll likely get the email when the time comes. If you are so interested in flying Biz on that short hop between CGK-SIN or SIN-CGK (I don't recall exactly your routing) then consider a mileage upgrade using KF miles maybe which should be possible even now (assuming your fare is eligible and there is upgrade space). YMMV.