Amazon return processing timeframe?

I had an Amazon account which just got closed due to returns. It got closed on Dec. 4 while I had sent back my items mid-November to get refunded and they received at their warehouse on Nov 23 @ 11pm. Now, whenever I drop off something at amazon I get an automatic refund, but specifically for these returns which went to some other Amazon warehouse in KY, it didn't generate an auto refund and before my account was closed, even though they had received it according to the tracking, it still says 'we will refund u when we receive your return' and today is dec 6 and still no return for those $600 items that i shipped back in a few packages. My question is how long it takes them to process a refund anyway? There was no issue with these 7 different shippments back to them although they were 1 order but the system generated several returns labels all going to the same amazon warehouse! Can someone tell me when it expects the returns im not even sure if they process returns during the weekends there was also one day for thanksgiving so im not sure whether to worry or not at this point as Im missing $600! How long it takes you to be refunded if not an automatic refund upon getting it scanned at UPS? Im thinking that if everything was returned in 1 box then perhaps it would have been lost but none of these 7 returns within 1 order are getting refunded still so im worried. It can't be that all 7 packages were lost at the warehouse right? all at once lol