Maintaining two per year for 500 years is more than sufficient.
Personally, I expect false starts in the next couple centuries. The beta testers will be healthy and fit into their hundreds, but those that follow may get to 200-400, then possibly further. There are just too many engineering issues to work out in a single iteration.
Personally, I expect false starts in the next couple centuries. The beta testers will be healthy and fit into their hundreds, but those that follow may get to 200-400, then possibly further. There are just too many engineering issues to work out in a single iteration.