There’s simply no way
There’s simply no way
There’s simply no way
Well there was a maple syrup heist where $18 million worth of syrup was stolen.
If you want an actual answer, it's not the leaves that go in but the sap inside the tree, and it's a 40 to 1 ratio of sap to syrup.
A bottle will need about 30 litres (8 gallons) of sap.