Expected number of rolls to cover all stops

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Suppose there is a board game, the map is a circle with 70 stops on it. The game uses a 6 faces fair die. Assume there is only 1 player, every time the player rolls a die, s/he will move counter clockwise based on the number shows on the die.

What is the expected number of rolls to get on every stop at least once on the map?

Any suggestion would be appreciated!

Thanks