That's a matter of some debate. Somewhere between 6 and 12, I believe, is the range. SpaceX plans to stretch the second stage to increase fuel carrying capacit

That's a matter of some debate. Somewhere between 6 and 12, I believe, is the range. SpaceX plans to stretch the second stage to increase fuel carrying capacity for tanker flights, so the actual number is TBD until both the revised Starship and its engines (Raptor 3) are built and tested.