expedia退款后多久到卡？

前几天在expedia退了一张机票，打完电话后收到一封邮件：Your flight is canceled. You will receive a
refund of $1,681.70 from Delta. The airline will apply a $250.00 cancelation penalty.

用的国内信用卡，退钱时他们没问我卡号。现在钱还没回来。一般是多久可以退给我呢？退到哪里呢？担心担心担心。