Rebuy Tourney questions

[JerBear77]

How do you guys determine when to rebuy and when not too??

My example....on Pokerroom $5 Rebuy yesterday


start with 1500, go down to 780 or so w/ blinds 20/40.
Do i rebuy here to go back up?

Then, later on...

I have about 1200 3 minutes or so before the break....would this be a time to rebuy and then also do the add-on??

I couldn't find anything on here that would help me with these questions..

Does everyone automatically do the Double rebuy entry at the beginning??