I pump till there’s no more milk. To make it faster, I usually use the other hand to press on the 4 quadrants of the breast sequentially, so that the breast emptied out faster, in like 15 minutes:) some electric pumps also have stronger settings. They help to empty the breast faster too.
Till no milk or little flow. Actually depends on ur goal. Whether u want to up supply or not. And also how tired you are.