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Zero. There was no time measured that long ago.
The answer is quintillion. Before quintillion in quadrillion then trillion. After quintillion is sextillion then septillion and so on.
1,000,000,000,000,000,000=1 quintillion
Since a quintillion has 18 zeros; one quintillion would look like this: 1,000,000,000,000,000,000
Hundred quintillion one.