So after how long is it safe to apply?
There isn't a real answer to that. I just applied 7 months after closing my SP, and got declined due to having the card less then 24 months ago. Everybody here says you can get approved right away even within the 2 year period, and unless your getting an instant approval, I, for the life of mine, don't understand how, if the system rejected you because of the 24 month rule, how you get around that.
Every rep. I speak to repeats the same thing, that you cannot get approved for the bonus again within 24 months.