Avguygeorge put it well. Experiment and let your ears tell you the answer to your question.
From my own personal experience, solid state sounds better if left on all the time. I unplug my Rega Planet (which is typically always on) when I'm out of town for more than a week or when there's a thunderstorm. It always takes it at least 48 hours to start sounding good again. A while back, I ran a full Adcom rig - 555 pre, 545 amp, 575 cdp. It too sounded better when always on.
As far as power consumption is concerned, your equipment doesn't draw much wattage at idle. Your whole rig, when at idle, probably consumes less wattage than a table lamp.
From my own personal experience, solid state sounds better if left on all the time. I unplug my Rega Planet (which is typically always on) when I'm out of town for more than a week or when there's a thunderstorm. It always takes it at least 48 hours to start sounding good again. A while back, I ran a full Adcom rig - 555 pre, 545 amp, 575 cdp. It too sounded better when always on.
As far as power consumption is concerned, your equipment doesn't draw much wattage at idle. Your whole rig, when at idle, probably consumes less wattage than a table lamp.