You can have as many worms inside of a box as you want, but obviously the more worms in the box the less food you can fit for them to eat.
My suggestion is to take a wooden box, place 5 worms across the middle row, then place food for them across the tops and bottom rows, like so:
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F F F F F
W W W W W
F F F F F
where F = food and W = worm
Then you can come every 24 hours replenishing both rows of food