When an air conditioner has been transported or moved, it is generally recommended to let it sit upright for at least 24 hours before turning it on. This is to allow any refrigerant that may have been disturbed during transportation to settle back into its proper place within the compressor.
During transportation or movement, air conditioners can get tilted or turned at angles that may cause the refrigerant to flow into areas it shouldn't be, potentially leading to compressor damage or other operational issues. Allowing the air conditioner to sit undisturbed for a sufficient amount of time allows the refrigerant to stabilize, ensuring that it functions properly when it's turned on.
Keep in mind that this recommendation may vary depending on the specific model and manufacturer. It's always best to refer to the user manual or manufacturer's guidelines for the particular air conditioner you have to get the most accurate information about the recommended waiting time before turning it on after transportation or relocation.