Late shipment rate is calculated when the percentage of your late ship orders over your total orders breaches the 20% threshold. Late shipment rate takes into account the past 30 days from the date that you were penalized with penalty point.
How are late orders defined? Orders are considered late when it is not shipped out within the Days to Ship set by sellers. The Days to Ship only takes into account Poslaju working days.
Total orders (in past 30 days) = 100 orders
Total late orders (in past 30 days = 20 orders
Total late orders/total orders = 20/100 orders = 20%