Try to customize a 15-inch MacBook Pro with a 4TB drive and you'll get a shipping notice of 5-6 weeks.
The NAND market is experiencing a supply glut, so it's unlikely Apple is experiencing any long lead times. I think it's a clear sign from Apple - "If you want a MacBook from the factory with a weird configuration, please wait. By the time we get the 4TB drive, the 15-inch model may not be available."

The NAND market is experiencing a supply glut, so it's unlikely Apple is experiencing any long lead times. I think it's a clear sign from Apple - "If you want a MacBook from the factory with a weird configuration, please wait. By the time we get the 4TB drive, the 15-inch model may not be available."
