I contacted Legacy Audio about leaving my Focus XD’s internal amps on or off, Ed said to leave them on all the time. Aurender recommends leaving the streamer on, so I do. Denafrips recommends just leaving my DAC and DDC on. (Neither has an on off button, the DAC does have standby though.) My Legacy Wavelet is on all the time. My Coda s5.5 amp has standby so I put it in standby when done, however when I plan to listen I try to turn it on at least 30 minutes before hand. Of course when we leave for FL in the winter everything is off and covered for 5 months.
In our home theater most everything is on all the time except for the Television, it’s on standby. (Sony) The Yamaha HT receiver turns itself off through HDMI e/Arc when the TV goes off.