How to calculate the begin turn time of PCBA?

In other words, When does the turn-time begin?
If you have asked some PCBA companies, you may know different PCBA plants have differing calculate methodturn time of PCBA.
That’s the reason why so many new PCBA engineers confuse this definition.

Complexity effecte PCBA turn time

As we know, there were many PCBA degrees.
Simple PCBA projects have short turn time, and more complexity projects must speed more time.
This means that the complexity of how to determine the turn time of PCBA services.

4MCPCB calculate PCBA turn time method

The good PCBA service has good turn time.
In our 4MCPCB policy, the turn time begins immediately after all the parts and PCBs are ready and the PCB files, Centroid, BOM, and all other necessary data.
The parts of PCBA mean all components require in PCBA process.
Then the PCB file includes Gerber files and other PCB files, etc.
Then Centroid includes Pick & Place PNP file, or XY Data or files in other formats.
The last but not least, the necessary data include documents, images, photos etc.
If you want to know turn time of PCBA project, please go to this link: