The number of time that I don't want to spend time on my clamping and had to deal with the consequence of it:
The wood move because I did not take time to clamp enough
The wood move because I did not want to screw to much
The wood move because the wood supporting the clamp moved during the process
The wood is not perfectly flat because I put only 3 clamp instead of 4.
By not clamping enough, the drill touch the border and make the holes wood vibrate and so the machine and so the screw ... Worst case scenario because it means that you have maintenance behind this stupid laziness of willing to win some time.
The number of time that I don't want to spend time on my clamping and had to deal with the consequence of it: