When can i remove batt after putting MBP to sleep?

I know the computer will save the memory, perhaps i can call it "hibernate" when i put it on sleep. how long after i put it to sleep can i remove the power cord and battery?

After you put the computer to sleep there is no need to remove the battery (nor the A/C power for that matter.)
The computer will not automatically hibernate. Only if the computer is dropped or receives some sudden motion will the computer go into hibernation to protect the hard drive.
If you want the computer to hibernate rather than go into normal sleep you will need to change the safe sleep parameter. To do that you need to use the Terminal app (Utilities folder.) Use this command line:
sudo pmset -a hibernatemode X
where X is the desired parameter:
= 0 : Default sleep behavior on most Apple computers. RAM is still powered on while sleeping. Wake up is fast. Safe sleep is disabled.
= 1 : Hibernation behavior. System is totally shut down while sleeping. RAM contents are dumped to disk. Wake up is slow.
= 3 : Default behavior on Powerbook HD computers. RAM is still powered on while sleeping. Wake up is fast. Safe sleep is enabled, so RAM contents are also dumped to disk before going to sleep.
You would want to use "3".
QS 1.33 GHz & 867 MHz; TiPB 1Ghz & 1GB RAM; Orig. G3 PB; 20 GB & 5 G   Mac OS X (10.4.7)   30 GB iPod Video (Black); MacBook Pro 2 Ghz

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