Yes, it's more like 3m, without measuring it now.

I have three Tapo C225 in use. Each power cable has a length of about 3 metres.

Hello, my C225 has a cable with a length of 3 metres. A cable from the C210 fits in terms of size, but the plug-in power supply has a lower output. C225: 12V/1A, C210: 9V/0.6A. However, you can use any power supply with cable that fits in terms of power, length and correct plug size. If you are unsure of the plug size, there are universal power plugs with cable and a range of plug sizes supplied that you can try out. However, the power supply should deliver 1A at 12V, as not only the electronics but also the motors need power to move the lens. You only need to set the output voltage on the power supply unit (here: 12V).