worm drive distance in 55 gal drum

i am installing a 55 gal plastic drum. how far into the drum should the pipe go? also how much of the worm drive should stick out into the drum? does my total distance into the drum include how much of the worm is in there?

I'd suggest instead placing two cinder blocks on both sides of the worm, cut a hole in the bottom of the barrel about half the diameter and place the barrel on the blocks. You'll get a hundred pounds more of coal on the worm that way if not more.

The pipe can enter the bin a few inches, but the worm length visible outside the pipe should be no longer than about 3 inches or 1 1/2 flights of worm.