About 10 days
If everyone is using electricity a day, it takes about 2-3 hours of electricity, and 20 hours of electricity is about 10 days.
Generally, water and electricity charges are collected in the dormitory, and the amount of water and electricity charges to be paid is shared equally.
It depends on the electricity in your dorm. 20 KWH won't last a few days. Every three months, each dormitory has to pay about 50 yuan for electricity
20 KWH electricity, if in a bedroom alone with lighting, about ten days or so, but if there are other appliances in the bedroom, such as air conditioning or chargers, this is not necessarily, because the conditions of each bedroom are not the same, according to the use of electrical appliances in the bedroom to calculate the use of electricity
About two months, 10 degrees a month, without the air conditioning
20 KWH electricity can be used for more than five days in one bedroom