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Faster, even in six or seven hundred years, it could be achieved.
The speed of the Life Burning Technique is indeed this fast.
Therefore, to reach his peak state, Lu Yuan just needed to use the Life Burning Technique.
He didn't have to, like other grand cultivators, rely on time to slowly increase his cultivation strength.
At most, he'd wait a millennium, and his current efficiency would double.
By then, the span of two thousand five hundred years could be shortened to just seventeen or eighteen hundred years.
This was only the first barrier where one needed to accumulate strength over time.
Upon reaching the second barrier, once Lu Yuan achieved his peak state, it would take just twelve or thirteen hundred years to grind through it.
The efficiency would be even faster.
Moreover, Lu Yuan was still a novice; he had only just begun to transport the Dao Fruit a few times for verification purposes.