Your numbers give Mars an extra ~800 million years. Nothing even close to 3/4 billion.
Besides, deciding what was inhospitable for early life is an exercise of noisy assumptions. I'd bet the error margin is larger than that difference.
Besides, deciding what was inhospitable for early life is an exercise of noisy assumptions. I'd bet the error margin is larger than that difference.
800 million is greater than 3/4 billion?