How long does it take for a 220 V / 50 Hz 20 W bulb to use one degree of electricity? I rent a house. I don't live for a long time. I can only use the 220 V / 50 Hz 20 W light bulb. How often do I use it

How long does it take for a 220 V / 50 Hz 20 W bulb to use one degree of electricity? I rent a house. I don't live for a long time. I can only use the 220 V / 50 Hz 20 W light bulb. How often do I use it

The general lamp is 220 V / 50 Hz, but the w number is different
In the case of ignoring other losses, once equal to 1000 watt hour is 1000 Watt lamp for one hour, then 20W lamp is 50 hours

How many hours does 1.3 billion kilowatt hour power supply "220 V, 100 W" electric lamp work
Help me to be more careful

1 degree = 1kW * h
therefore
Hours = 130000000 / 0.100 = 130000000 (hours)