Depends. I know some people who turn them off (due to conservation of energy).
I don't turn it off because I like to have wifi available in the morning or at night while I'm in bed. I don't have to get up and switch on the router and then wait for all my devices to connect. It is a convenience factor.
From my wifi scanning around my immediate vicinity, everybody (roughly 12 routers) has their wifi routers on 24/7.
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