Yes I have not gotten the offer and had a wait of 72 hours before I was given another. I know this from events and the 30 packs from iconic crew offer. I very seldom take the double offer.
I think the double-ups are the best way to get decent legendary crew. Alternatives are 15k dil in the Store, 50k honor (or 45k for random), and probably a few ten thousand dil to get into the top 25 of events. Of course you can also wait a year or so to get the same event again.
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This happened in the last couple weeks.