If you laid down your refrigerator during transport for less than 10 minutes, you can plug it in immediately once you have it in its final upright position. The general recommendation is to wait for the same amount of time that the refrigerator was lying down, or even slightly longer (up to 30 minutes), to allow the refrigerant to settle back into its proper position inside the compressor.
However, since you mentioned that it was laid down for less than 10 minutes, the amount of refrigerant disturbance is minimal, and you can safely plug it in right away. Just make sure it is in an upright position before connecting it to the power source. This will ensure that the compressor functions correctly and that your refrigerator cools efficiently.
If your refrigerator was laid down for a more extended period, such as several hours or during prolonged transport, it is advisable to wait for at least a few hours before plugging it in to allow the refrigerant to stabilize properly. Always refer to the manufacturer's guidelines and instructions for your specific refrigerator model, as they may have specific recommendations for handling and transportation.