7 feet 0.8 inches.
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2,300 mm = 7 feet 6.551 inches.
1 inch = 25.4 mm 979 mm = 979/25.4 inches = 38.54 inches = 3 feet 2.54 inches
From the US Mint's website: a penny is 1.55 mm thick and 19.05 mm in diameter. So if you stack 100 of them, the 'length' of the stack will be 155 mm (6.1 inches). If you lay them flat, touching, then it would stretch as long as 1905 mm (75 inches - just over 6 feet).
2 feet 3 inches are in 685 mm
120 mm is 0 feet 4.72 inches.