Up to this time in Silas Marner, how long has Silas lived in Raveloe?

On Chapter 1, part 1, we are given a good description of
Silas Marner, and this is also the part when we find out that he had been living
in Raveloe for 15 years as of that point in the story. The passage
reads:

It was
fifteen years since Silas Marner had first come to Raveloe; he was then simply a pallid
young man, with prominent short-sighted brown eyes,, whose appearance would have nothing
strange for people of average culture and experience, but for the villagers near he had
come to settle it had mysterious peculiarities which corresponded with the exceptional
nature of his occupation, and his advent from an unknown region called
"North'ard".

We know that
Silas is representative of the advent of the new and the onset of ambition, therefore,
his background helps create an air of mystery and foreshadowing about his
character.