It's strictly up to you
...nothing but user preference.
In my case, I turn on two systems every morn sometime between 0300 hours and 0800 hours (the variation is due only to what my plans are that day).
I'm retired so I have my day to myself. I leave both my systems on until I get ready to go to bed and I never use any of the hibernation or standby functions. I do allow my monitor to turn off if I go 30 minutes without using it...but I don't ever even consider anything but my present scheme. I use my computers as I feel necessary or want to throughout the day (one system is primarily for video-editing, recording TV, editing music) and I seldom have long periods of inactivity for each.
If I leave the apartment and know that I'll be gone for more than 30 minutes or so, I turn them off.
So my guide would be determined by user frequency.
I see hibernation and standby as strategies employed by persons who aren't using their systems consistently...but I could be wrong