Just to be contrary, I only run the machine about nine hours a day.
I need it up to start the LEDtriks at 3 p.m. The BIOS on my Compaq Deskpro doesn't know nothing about starting a computer, so I have a lamp timer do that. Scripts launch LTC.exe and later, kill it, launch Vixen at 6:30 and then kill it at 10 p.m.
The lamp timer goes off at 10:05.
By stopping the computer, I find that the likelihood of SSRs starting up lights of their own volition overnight is virtually eliminated.
HTH.
\dmc