Freeze for at least 2 hours or overnight 30d. Pellet nucleic acid by centrifugation 31d. Discard supernatant 32d. I came up with a year or so ago to quickly make up enough genomic DNA for PCR reactions. Remove the supernatant by aspiration and resuspend the pellet in 100 ml lysis buffer.
Phenol extract once.
Pellet 15' in microfuge. I use about 5 ul in a PCR reaction. Mix thoroughly, but try not to introduce too many bubbles. The volume used depends on the amount of cells used. If the aqueous phase is cloudy, add a couple hundred microliters of water to the tube and spin again.