How to calculate moving average DAYS of a date column

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I have these columns and data

customerid,date,orderqty
1,2020-11-25,100
1,2020-11-27,160
2,2020-12-05,3490
1,2020-11-29,293
2,2020-12-07,293
1,2020-12-01,382


                      
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