I recall reading that if I don't use the MBP for up to 2 days, then it's best to shut it down.
Is there a limit to the amount of time a MBP can be in sleep mode? (like before the battery gets completely drained)
Sleep drain: You may notice the battery in your Apple portable may drain up to 1% per hour (24% per day) while the computer is in sleep mode. This is normal behavior.
Reading a few posts into this link you provided, they mention that shutting down, can in the long run, wear out the hard drive a bit more than just letting it sleep. Any thoughts?
Do you guys turn off or sleep when going to work or school and back?