Which make and model DVD recorder do you have, and what are type of blank disks do you have?
Disks can be bought in single layer format (DVD5) which hold about 4.7Gb/120 mins, and double layer (DVD9) which holds 8.5Gb/240 mins. So, if your recorder supports double layer (DL) disks and recording, go out and buy some. Otherwise you are limited to 120 mins and will have to pause play and swop disks at a suitable point on the tape.
e.g.
Blank dual layer DVD+R disks,
dual layer DVD-R disks