My laptop is on standby most of the day when not in use. It's setup for ease of use.
I don't leave any other computer on. I shut them down when not in use. The others are for specific work.
The laptop is used for emails, surfing the net, and miscelaneous work.
With the cost of KWH in Hawaii, we don't have the luxury of inexpensive electricity so it makes sense to shutdown and conserve.