Usually within a week.
Once they issue the refund, it can take up to 5-7 business day.
For the first part of my order, it took 2-3 days.
For the last part (echo dot), it was supposed to already be credited, but for some reason it didn't
went through automatically,
so they re-did the 58$ refund manually and they told me to wait another 5-7 days to see it on my statement ...