Assuming this is the Model 3 long-range Musk is referencing, 1500 charging cycles would translate into 500,000 miles.
Tesla Model 3 Battery Replacement Cost
Updated on April 16, 2019
Model 3 drive unit & body is designed like a commercial truck for a million mile life. Current battery modules should last 300k to 500k miles (1500 cycles). Replacing modules (not pack) will only cost $5k to $7k.
— Elon Musk (@elonmusk) April 13, 2019
Assuming this is the Model 3 long-range Musk is referencing, 1500 charging cycles would translate into 500,000 miles.