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Whenever you want. There's no harm in asking. You can do it through chat and it takes all of 45 seconds. The worst they can say is no. I lowered mine from ~25.xx% to ~16.xx% with 3 chat sessions over 4 days I believe. The squeaky wheel gets the grease. And, if it doesn't, keep sqeaking until you do.
@Anonymous wrote:
So it's not like CLI's where it has to be a certain time frame?
Nope. You can try a day apart. Probably even less, (say) hours apart.
I agree with @AverageJoesCredit here. In my experience, Citi has never tossed anything my way when I was already in a special promotion of sorts. Once outside of that they’ve handed me BT’s and lower interest rates just about any time I’ve asked.