In my experience you can set different times to be ready each day of the week but it always assumes that if you plug it in you want it charged by the following day at the specified time.
If your objective, like some, is to not charge to full but leave the vehicle plugged in for battery conditioning during extreme cold or extreme hot ambient temperatures, I suggest you use "hilltop reserve" setting on a 2017 or set the max charge amount on a newer Bolt.
It will still charge to the level defined the first night but then will condition the battery more aggressively as it is plugged in