Dont worry about your SL.
Use it and pay it and apply again in 3 statement and minimum of 91 days.
Plenty of people getting 500 or 1000 on first card and 10k or 15k or 20k on their second just 3 months later.
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Is it 91 days from date of approval?
Congrats on your NFCU approval. Yes, it is 91 days and 3 statements from approval date.