I assume the fan's still spinning because it's just making the normal sounds that it does when the PC's running.
In "Settings" I've gone to System>Power & sleep, which has a sub-heading on it labelled "Screen" and under this sub-heading there's a drop-down box entitled "When plugged in, turn off after". The options in this box are various times ranging from 1 minute right through to Never. I've got "3 Hours" selected, but it's checking out on me long before this.
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