It was ~15 years between the V-2 rocket crossing the Karman line to a human walking on the moon. 15 years from now we will have time for a 10 year break followe

It was ~15 years between the V-2 rocket crossing the Karman line to a human walking on the moon. 15 years from now we will have time for a 10 year break followed by another 15 years before we'd need to launch such a 10 year mission to be there by 2075-2076. The real question "is there actually fund this engine and mission to bring that to completion in the next 40 years" than whatever the completion and reliability is today.