How to calculate the cycle time and price of PCBA factory processing in general?

According to Jingbang Technology's calculation method: the price is the sum of the number of electronic components and unit price, the price of the number of solder joints, engineering fees, labor costs and start-up costs, etc., the specific is not clear, the PCBA processing cycle is generally small batch production sampling in about 5 days, batch is generally in about 20 days.