Whenever you are going to burn your DVD always go for the highest quality setting, it might be called HQ and be set to 60 minutes. Bitrates also play a part, personally I use VBR or variable bit rate (the amount of data recorded to the disc goes up and down depending on the amount of detail, colour and movement in every scene) but others use one called Constant Bit Rate or CBR where it stays the same regardless of what is on screen. Always go for the highest settings when burning your final DVD.

__________________
Better than a poke in the eye with a pointy stick any day...