This is easiest on the Championship I maze as there are no sleeping ghosts building up a snake chacing you forcing you into position where you have to use a bomb, just try and stay alive for the 5 minutes but don't worry if you lose a life, just as long as you don't use a bomb!
Some further advice with thanks to McDurbin :- "All I did was go to the lower right hand corner and sit there, after about two minutes it launched one ghost out and I just kept slowly going around the border of the maze and it didn't drop another ghost till there was about 15 seconds left, in which it was easy to dodge the two."