how many episodes can i fit onto dvd?

how many 22 min episodes can i fit onto a dvd-r that is 4.7gb/120 min.? i use convertxtodvd to convert from avi, so that i can burn onto a disk. would i also need to shrink with a program like dvdshrink, to fit the maximum amount of episodes? or is it redundant to use two programs? does convertxtodvd do the job just fine on it's own? i really like this program as it is easy to use, but i dont know if it does any compressing as well? do people even use both programs together...converting and shrinking? thanks!

IF U USE ALCOHOL120% YOU CAN PUT A HOLE SEASON ON ONE DISK THE TRICKY PART IS YOU HAVE 2 HAVE AN XBOX360 OR PLAYSTATION 3 TO PLAY THAT FORMAT ON ALCOHOL120 YOU HAVE TO GO TO XTRA WIZARD DROP AND DRAG YOUR IMAGE AND THEN PRESS START THENWHEN DONE GO TO IMAGE BURNING WIZARD AND PRESS START I CAN FIT FIVE MOVES ON ONE DISK AND YOU DO NOT LOSE ANY QUILTY THIS IS COOL STUFF HOPE IT HELPS