2m 45s: Lenght
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Anor Londo bonfire, with Silver Serpent Ring on NG or higher. Simply kill the two Silver Knights and run back to the bonfire and repeat. Each run should take 30 secs to 1 minute, 12k to 16k per run. Some runs faster than others. You will get so many souls. I averaged about 200k every 10 mins, so over 1 MIL in under an hour.